Aquarium Breeder Box for Baby Fish, In-Tank Guppy Birthing and Fish Isolation Box

### A More Purpose-Built Nursery for Newborn Fry

Create a protected breeding and isolation space without losing sight of what is happening inside. This clear PP fish breeding box combines a two-level fry-separation system, approximately 2 mm fry drop holes, fine 1–1.5 mm water-exchange slots, dual feeding holes, removable dividers, and an airline connection in a flexible family of in-tank and external configurations.

### Why It Is Worth Choosing

**Two-Level Separation for Mother Fish and Fry**
The pregnant fish remains in the upper chamber while newborn fry can pass through the approximately 2 mm openings into the lower nursery space. This physical layout helps reduce direct contact with adult fish and can also be used to separate a vulnerable small fish from potential attackers.

**Fine Slots Balance Retention and Water Exchange**
Approximately 1–1.5 mm slots are positioned along the sides and bottom. They allow aquarium water to move through the box while helping reduce the chance of small fry slipping through wider openings. Because fry size varies by species and age, always compare the animal with the slot dimensions before use.

**Connect External Aeration When Needed**
The built-in airline port accepts a compatible air tube connected to an external air pump, giving you another way to support water movement and oxygen management inside the box. The port itself is not a pump; check the selected package to confirm whether tubing, an air stone, or a pump is included.

**Dual Feeding Holes Under a Covered Top**
Two feeding openings make routine feeding convenient and allow access to separate upper compartments. The lid helps reduce the chance of fish jumping from the breeding box while keeping the interior easy to view.

**Clear PP Construction**
The transparent PP body gives you a direct view of the pregnant fish, fry, or isolated animal. The source imagery describes the material as highly transparent and non-toxic; confirm the applicable supplier material documentation before publishing a formal non-toxic or regulatory claim.

**Removable, Reconfigurable Parts**
Remove or install the center divider to switch between two separate upper rooms and one larger isolation area. A removable support piece helps maintain spacing between the breeding box and the aquarium wall where applicable.

**Choose the Configuration That Fits Your Aquarium**
Options shown include compact single-room in-tank boxes, a larger dual-room aeration model, a rim-hook dual-room version with replaceable suction mounting, and an external freestanding version. Features and accessories are specific to the selected variant.

### Available Variants

- Small Single Room, in-tank: 8 × 7 × 10 cm / 3.1 × 2.8 × 3.9 in
- Large Single Room, in-tank: 10 × 7 × 13 cm / 3.9 × 2.8 × 5.1 in
- Dual Room with Aeration Port, in-tank: 18.5 × 9 × 15.5 cm / 7.3 × 3.5 × 6.1 in
- Hook-On Dual Room, in-tank: 17 × 9 × 11 cm / 6.7 × 3.5 × 4.3 in
- External Freestanding Version: 18 × 9 × 13 cm / 7.1 × 3.5 × 5.1 in

Select the exact model based on your aquarium dimensions, preferred mounting method, fish size, and intended use. The external version’s water supply/return setup and required accessories should be confirmed from the selected package instructions before operation.

### Suggested Use

Rinse and assemble the selected box before placing fish inside. For an in-tank suction-cup model, clean the aquarium glass, press each suction cup firmly into place, and confirm the box cannot shift. For the hook-on version, fit the hooks securely over a compatible aquarium rim. Install the breeding separator and optional center divider, then check that all parts are seated properly.

Place a pregnant livebearer in the upper section only near the expected delivery period. Monitor frequently and remove the adult after the fry have moved to the lower chamber. Keep the fine slots unobstructed, verify adequate water movement, and connect compatible aeration if required. Use the box for temporary breeding, isolation, or observation rather than permanent housing.

### Product Details

- Product type: Fish breeding, fry nursery, and temporary isolation box
- Material: PP
- Main structure: Covered transparent box with upper fish chamber and lower fry chamber
- Fry drop openings: Approx. 2 mm
- Water-exchange slots: Approx. 1–1.5 mm on side and bottom areas
- Feeding access: Dual top feeding holes
- Internal layout: Removable divider; single- or dual-room configuration on applicable models
- Mounting options shown: Suction cups, aquarium-rim hooks, and external freestanding placement
- Aeration: Airline connection on applicable version; external equipment may be required
- Removable support: Maintains spacing between the box and aquarium wall on applicable configuration
- Animals shown: Guppies, bettas, medaka, neon tetras, mollies, platies, ornamental shrimp, and similarly sized aquatic animals

### Why the Details Matter

This breeder box does more than separate fish with clear walls. Its measured drop holes and fine water slots address two practical concerns at once: guiding newborn fry away from adults and maintaining water exchange. Add the removable room divider, two feeding ports, optional airline connection, and multiple mounting formats, and you have a flexible breeding system that can be matched more closely to the aquarium you already own.

### 30-Day Quality Guarantee

Enjoy a 30-day quality guarantee. If your item arrives with a quality issue, contact us within 30 days of delivery so we can help with the appropriate resolution under our store policy.