Ziss Premium Breeder Box (BL-3T)

The Ziss Premium Breeder Box (model BL-3T) is a high-flow, hang-on breeding and isolation box that keeps fry, injured fish, and new arrivals safe in their own protected space. Instead of relying on tank current, it draws fresh, oxygenated water in through an air-driven uplift, so water inside the box stays clean and well circulated.

Pair it with the rest of our air pumps and accessories and browse our freshwater livestock to stock and grow out your breeding projects.

Features

• Air-powered water flow. A hose connects to an airstone that lifts fresh water into the box, constantly turning over the water without a separate pump.
• Stainless steel mesh bottom. A fine bottom screen adds extra flow-through while keeping fry safely inside.
• Convenient feeding hole. The lid has a feeding port so you can drop in food without removing the box or disturbing the fish.
• Two mounting options. Includes super-strong Ziss suction cups (what most hobbyists use) plus a hanging bracket for rimless tanks and thin rims.
• Versatile. Great for livebearer fry, egg layers, isolating bullied or sick fish, acclimating new arrivals, and short-term quarantine.

How It Works

Connect the included hose to an air pump (sold separately) and place the airstone in the uplift tube. As bubbles rise, they pull aquarium water up and through the box, then out the mesh bottom. This gentle, continuous flow keeps oxygen high and waste low, which is exactly what delicate fry and recovering fish need. Mount the box inside your tank with the suction cups or hanging bracket so the water line sits at the marked fill level.

Specifications

Recommended Pairings

• An air pump and airline to drive the water flow
• Aquarium Co-Op Brine Shrimp Eggs for hatching live baby brine, the gold-standard fry food
• Prolific livebearers like the Blue Wag Platy to put it to work

Frequently Asked Questions

Do I need an air pump?
Yes. The box uses air to circulate water, so you will need an air pump and airline (sold separately). Any standard aquarium air pump works.

Can I use it in saltwater?
Yes. It works in both freshwater and saltwater aquariums for fry, isolation, acclimation, or short-term quarantine.

What can I use it for besides breeding?
It is handy for separating bullied or sick fish, acclimating new arrivals, protecting fry, and holding fish during tank maintenance.

How does it attach to my tank?
It includes strong suction cups for standard tanks and a hanging bracket for rimless tanks or thin rims, so you can pick whichever fits best.