What Do Shrimp Eat – The Complete Guide To Feeding A Thriving Colony

If you have ever stood in front of your aquarium watching those tiny legs scurry across the moss, you have likely asked yourself: what do shrimp eat to stay so active?

I remember when I first started keeping Red Cherry Shrimp, I thought they would just survive on whatever “junk” was left over in the tank. I quickly learned that while they are amazing scavengers, providing a diverse and nutrient-rich diet is the secret to vibrant colors and successful breeding.

In this guide, I’ll share my years of experience to help you understand the dietary needs of your shrimp, from the microscopic biofilm they graze on all day to the specialized treats that make them swarm. By the end of this article, you’ll know exactly what do shrimp eat to thrive, not just survive.

The Core of the Shrimp Diet: Biofilm and Periphyton

The Foundation: Understanding the Natural Scavenger

In the wild, shrimp are opportunistic omnivores that spend nearly 100% of their waking hours foraging. Their primary source of nutrition isn’t actually “fish poop” or rotting waste, as some myths suggest. Instead, they rely on a complex ecosystem of microscopic life known as biofilm and periphyton.

The Importance of Biofilm

Biofilm is a thin, slimy layer of bacteria, algae, and fungi that grows on every surface of your aquarium—glass, rocks, driftwood, and plants. For a shrimp, this is an all-day buffet. If you see your shrimp constantly picking at the substrate, they are likely cleaning up the substrate by consuming the biofilm and organic detritus found there.

To encourage biofilm growth, many experienced keepers use products like Bacter AE. This powder adds microorganisms to the water that settle on surfaces, ensuring that even the smallest shrimplets have plenty to eat.

The Role of Periphyton

While biofilm is mostly bacteria and fungi, periphyton includes a mixture of algae and cyanobacteria. This is why shrimp are often sold as “algae eaters.” For example, many hobbyists rely on them for controlling hair algae, though they usually prefer softer varieties like green dust algae or diatoms.

what do shrimp eat: A Deep Dive into Specialized Diets

While biofilm provides a base, a closed aquarium system rarely produces enough natural food to support a growing colony. To keep your shrimp healthy, you must supplement their diet with high-quality commercial and natural foods.

High-Quality Shrimp Pellets

Unlike general fish flakes, specialized shrimp pellets are designed to sink and remain stable in the water for several hours. This is important because shrimp are slow eaters. Look for pellets that contain Spirulina and Chitin.

Chitin is essential for the development of their exoskeleton. Without enough of it, shrimp can suffer from “The White Ring of Death,” a failed molt that is often fatal. Providing a diet rich in minerals ensures they can shed their shells easily as they grow.

Algae Wafers and Veggie Sticks

Most dwarf shrimp species, such as Neocaridina and Caridina, love vegetable-based supplements. Using sinking wafers is a great way to observe your shrimp, as they will often congregate in one spot. If you want to see a “shrimp party,” try maximizing their health by offering high-quality wafers twice a week.

The “Gourmet” Kitchen: Fresh Vegetables and Botanicals

One of the most enjoyable parts of shrimp keeping is preparing fresh food. It is a cost-effective and highly nutritious way to round out their diet.

Blanched Vegetables

Shrimp love soft, blanched vegetables. Blanched zucchini is a fan favorite, but they also enjoy spinach, kale, carrots, and cucumber.

How to prepare them:

1. Slice the vegetable into small rounds.
2. Boil them in de-chlorinated water for 2-3 minutes until soft.
3. Drop them in cold water (ice bath) to stop the cooking process.
4. Use a skewer or a dedicated feeding dish to sink the veggie to the bottom.

Pro Tip: Never leave fresh vegetables in the tank for more than 2-4 hours. They break down quickly and can cause an ammonia spike that might harm your colony.

Leaf Litter and Botanicals

In their natural habitat, shrimp live among fallen leaves. Adding Catappa leaves (Indian Almond Leaves) to your tank provides two major benefits. First, as the leaves decompose, they grow a massive amount of biofilm. Second, they release tannins that have mild antibacterial and antifungal properties.

Another popular choice is Snowflake food, which is made from compressed soybean husks. It doesn’t foul the water and grows a specialized fungus that shrimp find irresistible.

Proteins and Mineral Supplements

While we often think of shrimp as vegetarians, they are actually omnivores. They need protein to grow and produce eggs.

Occasional Protein Boosts

In a community tank, shrimp will often find leftover fish food. However, in a species-only tank, you should occasionally offer frozen bloodworms or brine shrimp. This is especially helpful for berried (pregnant) females who need the extra energy to produce healthy eggs.

The Importance of Calcium

When discussing what do shrimp eat, we cannot overlook minerals. Calcium is the building block of their shells. If your tap water is very soft, you might need to add a mineral stone or liquid GH+ (General Hardness) supplement to the water. A shrimp that cannot form a hard shell after molting is extremely vulnerable to predators and stress.

Feeding Schedule: How Much and How Often?

Overfeeding is the number one cause of shrimp death for beginners. It leads to poor water quality, planaria outbreaks, and hydra infestations.

I recommend feeding only what they can consume in 2 to 3 hours. If you see food sitting on the substrate the next morning, you are definitely feeding too much.

A Sample Weekly Feeding Routine

Here is a simple schedule I use for my home colonies:

| Day | Food Type | Purpose | | :— | :— | :— | | Monday | High-Quality Shrimp Pellets | Balanced nutrition and Chitin | | Tuesday | Grazing Day (No Feeding) | Encourage biofilm consumption | | Wednesday | Blanched Spinach or Zucchini | Vitamins and fiber | | Thursday | Grazing Day (No Feeding) | Natural foraging | | Friday | Bacter AE or Powdered Food | Micro-food for shrimplets | | Saturday | Snowflake Food or Catappa Leaf | Long-term grazing | | Sunday | Frozen Bloodworms (Small amount) | Protein boost |

Unique Feeding Behaviors to Watch For

Understanding what do shrimp eat also involves watching how they eat. Different species have different methods.

Filter Feeders vs. Scavengers

Most hobbyists keep “scavengers” like Cherry or Crystal Red shrimp, which use tiny claws to pick at surfaces. However, species like Bamboo Shrimp and Vampire Shrimp are filter feeders.

They have fan-like appendages that they hold into the water current to catch floating particles. If you have filter feeders, you must provide powdered foods or crushed flakes that stay suspended in the water column, as they rarely eat from the substrate.

The Feeding Frenzy

When you drop a high-quality pellet into a tank of 50+ shrimp, you will witness a “shrimp ball.” This is perfectly normal behavior. It is a sign that your shrimp are healthy and have a strong feeding response.

Common Problems: Why Aren’t My Shrimp Eating?

If your shrimp are ignoring food, don’t panic immediately, but do investigate. Here are the most common reasons:

1. Abundant Biofilm: If the tank is mature and lightly stocked, they might simply be full from grazing on natural algae and bacteria.
2. Molting: Shrimp often hide and stop eating for 24 hours before and after molting.
3. Water Quality: High nitrates or ammonia can suppress their appetite. If they seem lethargic, test your water parameters immediately.
4. Temperature: In very cold water, a shrimp’s metabolism slows down, and they will eat significantly less.

Frequently Asked Questions (FAQ)

Do shrimp eat fish poop?

Contrary to popular belief, shrimp do not eat fish waste for nutrition. While they may pick through it to find undigested bits of food, it is not a staple of their diet and will not keep them healthy.

Can I feed my shrimp everyday?

You can, but it is often better to skip a day or two. This forces the shrimp to clean the tank and prevents the buildup of uneaten food in the substrate.

What do baby shrimp eat?

Baby shrimp (shrimplets) are born as miniature versions of adults but they don’t move around much. They need biofilm or powdered foods that land right next to them. This is where products like Bacter AE are invaluable.

Is copper in food dangerous for shrimp?

In very high concentrations, copper is toxic to invertebrates. However, many high-quality fish and shrimp foods contain trace amounts of copper sulfate which is actually a necessary micronutrient for their blood (hemocyanin). If the food is specifically labeled for shrimp, it is safe.

Do shrimp eat live plants?

Generally, no. Most aquarium shrimp will only eat dead or decaying plant matter. If you see them on a leaf, they are usually eating the biofilm growing on it, not the plant itself.

Conclusion: The Secret to Happy Shrimp

When you understand what do shrimp eat, you hold the key to a successful aquarium. By mimicking their natural environment—providing plenty of surfaces for biofilm, adding botanicals like Catappa leaves, and supplementing with mineral-rich pellets—you ensure your shrimp stay colorful and productive.

Don’t worry if you don’t have every specialized food on Day 1. Start with a good sinking pellet and some fresh veggies from your kitchen. As your colony grows, you can experiment with different treats to see what they love most.

Remember, the goal is variety and moderation. A clean tank with a well-fed colony is a beautiful sight to behold. Happy shrimp keeping!