Aquatop Nursery Box

The Aquatop Nursery Box (model NSB-01) gives newborn fry and vulnerable fish a safe, protected space right inside your existing aquarium. The clear box mounts in seconds with four suction cups, while a soft mesh net and removable divider let you separate fry, recovering fish, or aggressive tankmates without setting up a second tank. It works in both freshwater and saltwater systems.

Pair it with the rest of our Aquatop equipment, or stock up on hardy freshwater livebearers like guppies, mollies, and platies that breed readily and put a nursery box to good use.

Why You'll Want One

• Protects newborn fry from being eaten by larger tankmates until they are big enough to release.
• Isolates weak, sick, or injured fish so they can rest and recover without competition or harassment.
• Calms aggressive fish or new arrivals with a gentle in-tank time out before they rejoin the group.
• Removable divider holds two fish or two batches of fry apart in the same box.
• Soft mesh net lets water flow through, so the box stays at your main tank's temperature and water quality.
• Four suction cups mount it securely to the glass without taking up extra floor space.

How to Use It

1. Press the four suction cups firmly onto a clean section of the tank wall, near gentle flow but away from strong intakes.
2. Lower the box so the rim sits at or just above the waterline.
3. Add the divider if you need to keep two fish or two fry batches apart.
4. Move a gravid (pregnant) livebearer in before she drops, or transfer fry, sick, or aggressive fish as needed.
5. Feed lightly and remove any uneaten food daily, since the enclosed space is smaller than the main tank.

Specifications

Recommended Pairings

• Aquarium Co-Op Brine Shrimp Eggs for nutritious live first food that fattens up growing fry.
• Aquatop Pisces 25W Nano Heater to hold a stable temperature in smaller grow-out tanks.
• Aquatop Breza Air Pump for gentle aeration and a backup during power outages.
• Browse all Aquatop gear and our full range of freshwater fish.

Frequently Asked Questions

What is a nursery box used for?
It creates a protected space inside your main tank to raise newborn fry, recover sick or injured fish, or give an aggressive fish or new arrival a short time out, all without running a separate tank.

Does it work in saltwater tanks?
Yes. The Nursery Box is safe for both freshwater and saltwater aquariums.

How does it attach, and will it block flow?
Four suction cups press it onto the inside glass. The mesh net lets water pass through, so the fish inside share your main tank's temperature and water quality. Mount it near gentle flow, not directly in front of a strong powerhead or intake.

Is it big enough for adult fish?
At 5.5 x 6 x 6 inches it is sized for fry, small fish, and short-term recovery or isolation. It is not meant for long-term housing of larger adult fish.