Aquarium shrimp eat leftover food from fish, algae on tank surfaces, and sinking pellets designed for bottom feeders

Shrimp are scavengers by nature, which means they spend most of their time picking through the tank floor and surfaces looking for food. In a tank with fish, shrimp often survive on scraps—uneaten fish food that sinks, dead plant matter, and decaying organic material. However, relying entirely on leftovers is risky because you cannot control how much your shrimp actually eat, and they may go hungry if your fish are efficient eaters.

The safest approach is to feed shrimp deliberately with food designed to sink and stay on the bottom where they forage. This gives you visibility into whether they are eating enough and lets you adjust portions based on what you observe. Shrimp also need plant matter as a significant part of their diet, which is why many experienced keepers add live plants or blanched vegetables to the tank.

Key Takeaways

  • Sinking pellets made for bottom feeders or shrimp are the most reliable staple food because they reach the tank floor where shrimp naturally forage.
  • Blanched vegetables like zucchini, spinach, and cucumber provide essential plant matter and should be removed after 24 hours to prevent water quality problems.
  • Shrimp also eat algae wafers, dried seaweed, and leftover fish food, but these should supplement rather than replace a consistent feeding routine.
  • Feed small amounts—only what shrimp can consume in two to three hours—because uneaten food decays and damages water quality.
  • In established tanks with live plants and algae growth, shrimp may need less supplemental food but still benefit from occasional vegetable offerings.

Sinking pellets and specialized shrimp foods

The most straightforward way to feed shrimp is with sinking pellets formulated for bottom feeders or shrimp specifically. These pellets are denser than floating fish food and sink quickly to the substrate where shrimp spend their time. Common brands include Hikari Sinking Wafers, Fluval Bug Bites (sinking formula), and Aqueon Shrimp Pellets, though many regional suppliers carry their own versions.

Shrimp pellets typically contain plant matter, algae, and sometimes added minerals like calcium, which shrimp need for shell and exoskeleton health. A small pinch—roughly the size of a pea for a 10-gallon tank—is enough for a group of 5 to 10 shrimp. Drop the pellets in one spot so you can watch whether they disappear. If pellets remain on the bottom after a few hours, you are feeding too much.

Algae wafers are another sinking option and work similarly to pellets. They are slightly softer and break apart more easily, which some shrimp prefer. If you keep both shrimp and bottom-feeding fish like plecos or corydoras catfish, algae wafers can feed both, though you may need to increase portions.

Blanched vegetables and plant matter

Shrimp are primarily herbivorous and need regular plant matter in their diet. The easiest way to provide this is by blanching vegetables—boiling them briefly until soft, then cooling them—and placing them directly in the tank. Zucchini, spinach, and cucumber are the most common choices because they are soft enough for shrimp to eat and do not cloud the water.

To blanch zucchini, slice it into thin rounds, boil for one to two minutes, cool it in tap water, and drop a piece into the tank. Shrimp will begin grazing on it within minutes. Leave the vegetable in for no more than 24 hours; after that, remove any uneaten portions because decaying food releases ammonia and nitrite, which harm shrimp and fish alike.

Spinach and other leafy greens work the same way but break apart faster, so monitor them closely. Some keepers tie vegetables to a small rock or plant weight to keep them in one place and make removal easier. Avoid vegetables treated with pesticides or fertilizers; buy organic or grow your own if possible.

Live plants and natural grazing

Shrimp in tanks with established live plants often need less supplemental food because they graze on algae, biofilm, and decaying plant matter throughout the day. Moss, particularly Java moss and Christmas moss, is ideal because it grows slowly, provides hiding spots, and accumulates the organic material shrimp naturally eat. Anubias and Bucephalandra are also good choices because they are hardy and do not require high light or fertilizer.

Algae is not a problem in a shrimp tank—it is a food source. Light algae growth on glass and decorations is normal and healthy. If you have a heavily planted tank with good lighting, you may only need to feed shrimp pellets or vegetables once or twice a week rather than daily. Observe your shrimp's behavior: if they are actively foraging and appear well-fed, you are on the right track.

New tanks without established plant growth or algae will need more frequent supplemental feeding. As the tank matures and biofilm and algae develop, you can gradually reduce how often you add pellets or vegetables.

How often and how much to feed

Feed shrimp once daily or every other day, depending on tank conditions. In a mature tank with plants and algae, every other day is often sufficient. In a newer tank or one without much plant growth, daily feeding is safer. The key is to feed only what shrimp can consume in two to three hours.

A practical routine: drop a small pinch of pellets into the tank and watch for 30 minutes. If shrimp gather and begin eating, you have found roughly the right amount. If pellets remain untouched after an hour, reduce the portion next time. Uneaten food is the most common cause of water quality problems in shrimp tanks, so it is better to underfeed slightly than overfeed.

If you keep shrimp with fish, be aware that fish will eat shrimp food if it floats or if they can reach it. Feed fish first, wait for them to finish, then add shrimp food in a separate area of the tank where shrimp naturally congregate—usually near plants or in darker corners.

Calcium and mineral supplements

Shrimp need calcium and other minerals to maintain healthy shells and exoskeletons, especially during molting. If your tap water is soft (low in minerals), or if you use reverse-osmosis water, adding a mineral supplement is important. Products like Salty Shrimp Mineral GH+ or Flourish Comprehensive are designed for this purpose and are dosed according to tank volume.

Many commercial shrimp pellets already contain added minerals, so if you feed a quality pellet food regularly, you may not need a separate supplement. However, if you feed primarily blanched vegetables, a mineral supplement becomes more important. Test your water hardness with an inexpensive GH (general hardness) test kit; if it reads below 4 degrees GH, consider adding minerals.

What not to feed shrimp

Avoid feeding shrimp meat-based foods, high-protein fish pellets, or anything with artificial dyes or heavy preservatives. Shrimp are herbivores and cannot digest meat efficiently; high-protein diets can cause digestive problems and water quality issues. Do not feed them processed human food, bread, or anything with salt.

Some aquarium foods marketed as "all-purpose" are designed for omnivorous fish and contain too much protein for shrimp. Read the ingredient list: the first ingredient should be plant matter (algae, spirulina, or vegetable) rather than fish meal or animal protein. If you are unsure whether a food is safe, stick with products labeled specifically for shrimp or bottom feeders.

Frequently Asked Questions

Can shrimp survive on just fish food leftovers?

Shrimp can survive on leftovers in the short term, but it is unreliable. Fish may eat most of the food before it sinks, or your shrimp may go hungry if fish are efficient eaters. Deliberate feeding with sinking pellets or vegetables gives you control and ensures shrimp get enough nutrition.

How long can shrimp go without food?

Shrimp can survive two to three weeks without supplemental food if the tank has algae, plants, and biofilm to graze on. However, they will not thrive, and growth will slow. In a new tank without established algae, shrimp should be fed at least every other day.

Do shrimp need different food than fish?

Yes. Shrimp are herbivores and need plant-based food that sinks to the bottom. Most fish pellets float or sink slowly and are too high in protein. Shrimp-specific pellets or blanched vegetables are better choices because they match shrimp's natural diet and feeding behavior.

What happens if I overfeed shrimp?

Uneaten food decays on the tank bottom, releasing ammonia and nitrite, which poison shrimp and fish. Overfeeding also causes algae blooms and cloudy water. Feed only what shrimp consume in two to three hours and remove any leftovers after 24 hours.

Can I feed shrimp dried bloodworms or brine shrimp?

Dried bloodworms and brine shrimp are high in protein and not ideal as a regular diet for freshwater shrimp. They can be offered occasionally as a treat, but plant-based foods should make up the majority of what shrimp eat. If you feed these, do so sparingly and remove uneaten portions quickly.