A:

Multifunctional Acrylic Fish Breeding Isolation Box Dual Layer Incubator For Fish Tank Aquarium 

Features:
To prevent adult fish attack and to improve the survival rate of juvenile fish.
Multifunction isolation box: Exquisite workmanship, transparency and compact.
There are cracks on both sides, to ensure the flow of water within the tank and isolation box.
The unique floating design, can move anywhere, not sink, double combination, does not occupy space.
Unique transparent cover, ensure the fish does not incite, middle of the hole,to facilitate feeding.
Floating design, double layer combination, can save space for you.

Specifications:
Color: Transparent

Material: Acrylic 

Size: 
S: approx. 8x7x11cm/3.14x2.75x4.33in
L: approx. 10x7x13cm/3.93x2.75x5.11in

B:
Features:
1. It can be used as the oviposition box of fish to produce embryos.
2. It can Prevent attack from adult fish, improve the survival rate of juvenile fish.
3. Isolation function: It can isolate aggressive fish, injured fish or small fish.
4. Unique transparent cover design to prevent fish from jumping out of the box.
5. High quality suction cups can be used to secure the product.
6. Floating design, double-layer combination, saving space.

Specifications:
Color: Transparent
Material: Acrylic
Product size: Small
S: 15*10*8cm / 5.91*3.94*3.15"

C:
Transparent Acrylic Aquarium Breeder Hatchery Box Betta Fish Tank Isolation Box Juvenile Fish Breeding Box Incubator Holder
Feature:
1. Made of acrylic, transparent texture, allowing you to observe without any obstruction.
2. Prevent fish from escaping from the isolation room and protect newborn fish.
3. With suction cup, easy to fix.
4. It is a hatchery for viviparous fish, such as betta, guppy, medaka, etc.
5. It can prevent adult fish from attacking and increase the survival rate of juvenile fish.

Specification:
Material: Acrylic
Size: 12.5*7*7cm

Note:
Please allow 1-3mm differs due to manual measurement.
Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.