What Do Ghost Shrimp Eat? A Practical Feeding for Healthy

Biofilm, algae, and detritus form a quiet baseline diet for ghost shrimp, with richer foods layered on top for variety. Ghost shrimp (Palaemonetes paludosus) are opportunistic omnivores that rasp microorganisms off every wet surface and pick through soft sediment for invertebrate eggs, plant litter, and any protein that drifts past. A small sinking pellet or a blanched zucchini slice supports growth, but the tank itself supplies most of the daily calories.

This guide explores how to feed ghost shrimp well, covering the wild diet that shapes their needs, the biofilm baseline every aquarium provides, prepared and fresh food options, and the calcium link to successful molting.

The Wild Diet That Shapes Captive Feeding

Ghost shrimp live in slow-moving creeks, ditches, and weedy ponds across the eastern United States, where the water runs low in dissolved nutrients but high in surface growth. Their native menu is a thin, steady buffet rather than three daily meals. Anything that grows, dies, or drifts past their fan-like mouthparts gets tested, tasted, or torn apart.

Why the Scavenger Label Fits

You call them scavengers because they rarely chase live prey, yet they never pass up a meal either. They pick at submerged oak leaves, scrape algae off cattail stems, and sift through soft sediment for invertebrate eggs. That flexible habit explains why a tank crowded with sinking pellets can still leave them hungry, and why a mature planted tank with no extra feeding often keeps them fat.

For a community setup, the comparison matters more than the species name. Amano shrimp (Caridina multidentata) and Neocaridina davidi cherry shrimp share the same scavenger baseline, but ghost shrimp lean slightly more carnivorous, so they can pick off a weak or freshly molted neighbor if protein runs short.

The Foundation Most Keepers Overlook

Aufwuchs, the slimy community of algae, bacteria, fungi, and protozoa coating every surface underwater, feeds ghost shrimp around the clock. Detritus, the broken-down plant and animal litter resting on the substrate, supplies the rest. Both items are nearly invisible at a casual glance, which is why new keepers assume their shrimp must be starving while a mature tank is already feeding them.

That invisible pantry becomes a problem only when the colony outgrows it, and overstocked tanks run through biofilm faster than it can regenerate.

“A bare, sterile-looking tank is often the hungriest tank for ghost shrimp. Crystal-clear water has nothing to scrape, and your shrimp wait quietly for the next pinch of food to arrive.

The Hidden Baseline: Biofilm and Detritus in the Aquarium

Biofilm is the single most important food source in any ghost shrimp tank, and it is almost always underfed by the keeper who believes they feed daily. Biofilm is a living mat of microorganisms that colonizes every wet surface, from the glass to the inside of the filter intake, and it is exactly what ghost shrimp are built to rasp off with their chelipeds.

Reading the Tank’s Biofilm Level

A healthy tank shows a faint green dust on the hardscape, brown diatom patches on new driftwood, and a lightly filmed front glass. A tank that stays glass-clear without scrubbing, with no visible algae on wood or stone and no detritus in corners, is biofilm-poor, and your shrimp run on supplements alone.

Watch the shrimp themselves rather than the water. Active, constantly-moving legs, regular molting, and visible grazing on glass and decor all signal a well-fed colony. Shrimp that huddle on the substrate, climb the waterline, or lunge aggressively at any food added need more biofilm or more food overall.

Cultivating Biofilm in a New or Overly Clean Tank

• ▸Add Indian almond leaves: A single catappa leaf develops a rich, edible coating within two to three weeks, and ghost shrimp park themselves on it for hours.
• ▸Include real driftwood: Cholla, mopani, and Malaysian driftwood host biofilm faster than inert decor and double as grazing surfaces.
• ▸Lower light intensity: Subdued lighting favors diatoms and green spot algae, both of which feed the same microorganisms the shrimp target.
• ▸Skip the full water change: Replacing 90% of the water strips the microbial community your shrimp depend on; top off, vacuum lightly, and let the tank age.
• ▸Toss in a small piece of cuttlebone: It slowly dissolves, buffers pH, and becomes a biofilm-coated grazing block within a month.

Detritus sits on the same baseline. A thin, fluffy layer of mulm around plants and driftwood is a feature, not a flaw. It crosses into harmful territory only when it compacts into thick mats, releases hydrogen sulfide, or fuels an ammonia spike. Siphoning a third of the substrate during routine water changes keeps the helpful layer while removing the harmful buildup.

Prepared Foods That Round Out the Diet

Prepared foods are the easiest, safest way to cover the protein, plant, and mineral gaps that biofilm cannot fill alone. The mistake is using them as the entire diet, which causes overfeeding, fouled water, and lazy shrimp that stop foraging.

Choosing the Right Pellet or Wafer

Sinking pellets beat floating flakes for ghost shrimp because the animals are bottom-dwellers by trade. A 0.5 to 1 mm pellet, such as a sinking shrimp pellet, reaches the substrate intact and stays available for slow grazers. Algae wafers work, but break them into quarters so a single shrimp does not guard the whole piece.

Flake food is fine when crushed between your fingers into a fine dust that sinks before fish can steal it. Crushed flake works well in tanks with small-mouthed tetras or fry because it disperses evenly and gives every shrimp a fair shot.

Reading Labels Before You Buy

Two ingredients matter most: protein percentage and copper content. A pellet with 35 to 45 percent crude protein supports growth and breeding; anything above 50 percent stresses the filter and burdens the shrimp’s liver. Copper, sometimes listed as copper sulfate or copper aminoate, is toxic to all shrimp at concentrated levels, so any product listing it as a top-five ingredient should stay on the shelf.

Even the cleanest commercial crumble leaves nutritional gaps, and fresh options fill the spaces pellets cannot reach.

Food Type	Best Use	Watch For
Sinking shrimp pellet	Daily staple supplement	Hard to break apart; pre-soak in tank water
Algae wafer	Plant-matter boost, weekend feed	Large pieces; break into quarters
Crushed tropical flake	Quick energy in community tanks	Floats; crush finely or fish steal it
Bottom-feeder tablet	Heavy feeding days, post-medication recovery	Higher protein; reduce portion size
Wafers with spirulina	Color enhancement, molting support	Binders that cloud water if overfed

Fresh Foods Worth Offering (and How to Prep Them)

Fresh foods deliver micronutrients that processed pellets lose during manufacturing, and they trigger a feeding response pellets never match. Offer them once or twice a week, and always remove what is left within 12 to 24 hours to keep ammonia in check.

Vegetables That Work and How Long to Blanch Them

• ▸Zucchini: Slice ¼ inch thick, blanch 60 seconds, weigh down with a fork or stainless clip, remove after 12 hours.
• ▸Spinach: Use a single leaf, blanch 30 seconds until limp, drop it in whole, and pull the remains the next morning.
• ▸Cucumber: Cut a coin-sized disc, blanch 45 seconds, peel if not organic, and remove within 24 hours.
• ▸Carrot: Slice paper-thin with a vegetable peeler, blanch 90 seconds, and offer sparingly because it softens water quickly.
• ▸Romaine lettuce only: Crisp leaves for 30 seconds, skip iceberg because it has almost no nutrition, and remove the leftover.

Protein for Growth and Breeding

Live and frozen protein foods help condition ghost shrimp for breeding while supporting rapid growth in newly molted juveniles. Frozen bloodworms, daphnia, and baby brine shrimp are the three most useful. Thaw a small pinch in tank water before adding so the cold does not shock the colony, and offer it no more than twice a week to keep nitrate low.

“Overfeeding fresh protein is the fastest path to a bacterial bloom. A single frozen bloodworm cube feeds a colony of thirty ghost shrimp for one meal. Drop in less than you think you need.

Calcium, Molting, and the Mineral Connection

Every successful molt depends on calcium, magnesium, and a handful of trace minerals the shrimp pulls from the water and its diet. A diet rich in protein but low in minerals produces shrimp that struggle to escape their old shells, leaving partial molts and dead bodies on the substrate.

Sources You Can Add Today

Cuttlebone, the same white block sold for pet birds, releases calcium carbonate slowly and is the cheapest, safest option. Drop a one-inch piece directly into the tank or stuff it inside the filter, where the dissolving water spreads through the entire system. Crushed coral, added to a mesh media bag in the filter, works similarly and stabilizes pH for hard-water species like livebearers. Crushed eggshell, baked at 250°F for ten minutes and then pulverized, is a no-cost option for a single small tank.

Spotting a Molt Problem Early

Look for opaque, milky-white patches on the shell, slow movement, and shrimp that hide for more than 48 hours after a molt. Each sign points to insufficient minerals in the water or a GH below 6 degrees. A liquid calcium supplement, dosed after a 25 percent water change with remineralized RO water, can rescue a colony within two to three molting cycles.

When ghost shrimp share a tank with soft-water fish such as South American tetras or wild bettas, do not push general hardness above the fish’s preferred range. Use calcium-rich foods and cuttlebone to deliver minerals through diet while keeping GH steady at 4 to 6 dGH for the fish.

Getting minerals into the water is only half the equation; how much and how often you feed decides whether the colony actually absorbs them.

Portion Sizes, Schedule, and Foods to Avoid

A simple, predictable schedule prevents the two most common ghost shrimp problems: hidden starvation from faster tankmates, and ammonia spikes from uneaten food. Match the routine to your bioload, not the calendar on the wall.

A Realistic Daily and Weekly Routine

Feed once daily in a colony of fewer than 20 shrimp, or every other day in a heavily stocked tank. A portion is roughly one sinking pellet per three adult shrimp, or a thumbnail-sized piece of blanched vegetable for the whole colony. Remove uneaten food after 12 hours for protein, 24 hours for vegetables.

Watch what happens rather than what you added. Food consumed within two hours signals correct portion sizing. Food still sitting on the substrate the next morning means you are overfeeding, and the tank is doing more filtering than feeding.

Foods to Avoid and the Reason Behind Each

• ▸Anything with copper sulfate: Lethal at low concentrations; check every medicated food and plant fertilizer.
• ▸Raw garlic or onion: Contains thiosulfate compounds that damage shrimp hemolymph even in tiny amounts.
• ▸Citrus fruits: Acidic pH drops and essential oils burn gill tissue; never add lemon, lime, or orange.
• ▸Unwashed vegetables: Pesticide residue kills shrimp faster than any other cause; buy organic or rinse thoroughly.
• ▸Live blackworms: Carry parasites and can burrow into substrate, emerging later to bother molting shrimp.
• ▸High-fat mammalian meat: Beef heart and similar foods rot within hours and spike ammonia, even at small portions.

Behavior as a Feeding Gauge

Active foraging across the substrate, glass, and decor in loose groups signals a well-fed, low-stress colony. Lethargy, constant hiding, and a single shrimp guarding a food pile point to a feeding imbalance. Clouded, whitish shells that linger for more than a day indicate a molt problem, and a sudden spike in floating dead bodies usually means overfeeding crashed the cycle within the last 48 hours.

Adjust by pulling food, doing a 25 percent water change, and running extra filter media for a week. The colony typically rebounds within one molt cycle if caught early.

Bottom Line

Ghost shrimp thrive when the tank itself does most of the feeding through a mature biofilm layer and a thin veil of healthy detritus, with prepared, fresh, and mineral-rich foods used as targeted supplements. Build the foundation first, treat supplements as a quarter of the diet rather than the whole of it, and your shrimp will molt cleanly, breed steadily, and quietly handle the cleanup work you added them for.

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