Category: Aquarium & Breeding Guides

Give your smallest fish somewhere to retreat—and a feeding routine that reaches them. A group of AquaNest mops adds flowing color and soft cover to a breeding setup. The next step is making sure the babies can find food without turning their hiding place into a pocket of leftovers.

First, choose the right breeding setup

Livebearers: guppies, platies and mollies give birth to swimming fry. Several mops grouped together can offer places to retreat in a shared tank. Adults may still eat fry; use a separate, properly prepared grow-out tank when greater separation is your goal. See our guppy cover guide.

Egg-layers: for suitable mop-spawning species, collect eggs by moving the egg-bearing mop to a prepared hatching setup. Leave the adults behind. Feeding starts at the appropriate developmental stage for that species; newly hatched fry may initially rely on their yolk sac. Read our egg-collection guide.

Match the food to the mouth

Many livebearer fry can take newly hatched baby brine shrimp or appropriately sized prepared fry food. Tiny fry from some egg-laying species need smaller first foods, such as suitable infusoria cultures. “Baby fish” is not one feeding category: confirm the needs of your species and watch whether the fry actually swallow what you offer. Aquarium Co-Op’s guide to tiny fry foods explains the different options.

Arrange cover with a reachable feeding edge

Try grouping mops along part of the tank rather than filling every open space. Leave an edge where you can see the fry and place small portions nearby. This is a practical layout suggestion, not a tested formula for a particular number of fry.

• Use floating mops for hanging cover near the surface, or non-floating mops for lower cover once soaked.
• Keep strands clear of filter intakes and leave water circulation and swimming routes open.
• Use a pipette for suitable suspended foods if needed, dispensing gently beside the cover rather than blasting into the strands.
• Observe for a few minutes. Food falling into an empty corner is not the same as food reaching the fry.

Small meals, followed by a quick check

Fry often need several small meals spread through the day. The amount and frequency depend on species, size, food and water quality. Start with a tiny portion, look for feeding activity, and remove uneaten food before it accumulates. Keep up appropriate water testing and careful water changes. A mature biofilm may offer grazing opportunities, but it is not a measured or complete fry diet.

Keep the mops easy to clean

A removable habitat makes routine inspection simpler. Before lifting any mop, check carefully for eggs, fry, shrimp and snails. Gently swish an empty mop in removed aquarium water to release debris, then return it to position. Use no soap. Leave an egg-bearing mop in its appropriate hatching setup rather than rinsing it as part of ordinary cleaning. Our cleaning guide covers care in more detail.

Make a habitat you enjoy watching

Choose a coordinated palette, group the mops into useful cover, and keep a clear view of the feeding area. AquaNest mops are washable and reusable, with floating and non-floating options and a suction cup included. Explore Purple Reef or browse all colors to build your own arrangement.

Further reading: Aquarium Co-Op: raising baby fish and breeding egg-scattering fish. These sources support general husbandry guidance, not an endorsement of AquaNest.

Watch a cherry shrimp work its way along a plant or a piece of wood: it keeps picking at the surface. Much of that grazing happens on biofilm, the thin community of microorganisms and organic material that develops on submerged surfaces. For a shrimp breeder, those surfaces are part of the feeding environment.

A spawning mop gives biofilm many strands to colonize in a compact space. AquaNest mops contain approximately 200 strands of acrylic yarn. Once conditioned in an established aquarium, those strands can become additional grazing surfaces for adult shrimp and their young.

Illustration: our Green Forest floating mop. Shop Green Forest.

Watch shrimp explore the yarn

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Why biofilm matters in a shrimp breeding tank

Biofilm can include bacteria, microscopic algae and other tiny organisms. Its composition changes with the aquarium and the surface it grows on. It is a living community, rather than one specific food.

Research on Neocaridina davidi, the species that includes cherry shrimp, has examined reproduction and juvenile development in biofilm-based systems. A 2020 study found that shrimp could complete their life cycle in the tested system, with outcomes varying between artificial substrates. This supports the value of established grazing surfaces, but the study did not test AquaNest mops. Read the research on Neocaridina and biofilm.

In a home tank, treat a conditioned mop as one part of the habitat alongside appropriate feeding, filtration and stable water conditions. Adding a mop alone is not a promise of more babies or a particular survival rate.

How yarn adds so much usable surface

A mop is more than the outline you see from the front. Every strand has a surface running along its length and around its circumference. Spread those strands out underwater and the aquarium gains many separate places for organisms to attach and shrimp to explore.

That is the practical appeal of approximately 200 strands: a large amount of distributed surface in a small footprint. Water and shrimp need access between the strands, so a loosely arranged mop is more useful for grazing than a tightly compressed bundle.

We have not measured a square-foot figure or a biofilm growth multiplier for our mops. The benefit we can describe is the structure itself: numerous submerged yarn surfaces, with room to position them where you can observe and maintain them. The acrylic supports growth on its surface; it is not food for shrimp.

Setting up a mop for shrimp grazing

1. Start with an established shrimp aquarium. A new mop does not arrive with a mature food supply. Give it time to condition in the tank before relying on it as a grazing area.
2. Rinse before use. Use clean, dechlorinated water and no soap. Separate the strands gently.
3. Choose an accessible position. Use the included suction cup to place the mop where shrimp can reach it and you can inspect it. Keep strands away from filter intakes and leave space for water movement.
4. Watch the shrimp and the mop. Look for grazing activity and check for accumulated debris. There is no universal number of days when every mop becomes fully conditioned.

Floating or non-floating?

Choose the version that suits your layout. A floating mop suspends strands from the surface; a non-floating mop gives you another option for positioning them lower with the suction cup. New non-floating yarn may take time to wet and settle. For shrimp, accessible placement and maintenance matter more than choosing a color.

Keep the grazing area clean without starting over

If debris collects, check carefully for tiny shrimp before moving the mop, then gently swish it in removed aquarium water. Routine debris removal and disinfection are different jobs: disinfecting a mop also removes the established community you are trying to keep. Follow a separate cleaning procedure when equipment needs to move between tanks.

Continue providing suitable shrimp food and monitoring water quality. Do not overfeed to force biofilm growth. A species-only shrimp tank also avoids the baby-shrimp predation risk posed by many fish. Aquarium Co-Op’s cherry shrimp care guide covers feeding, habitat and breeding basics.

Add a grazing surface to your setup

Explore the AquaNest Green Forest spawning mop, or browse all mop colors and select floating or non-floating on the product page. For setup questions, visit our spawning mop FAQ. You can buy as a guest without creating an account.