【Two dimensions】- Big size is about 26 x 15 x 15 cm / 10.2 x 5.9 x 5.9 Inches, Small size is about 15 x 15 x 14 cm / 5.9 x 5.9 x 5.5 inches. The fish breeder net will increase the survival rate of breeded fish by separating the aggressive fish and weak fish.The ultra-fine mesh surface can prevent impurities from entering your fish tank..【High quality material】- The aquarium breeding box is made of soft Nylon net and plastic frame, safe and secure tank for breeding, isolating or acclimating fish. You can clearly observe inside condition..【Easy installation】- Comes with 10 suction cup for fry hatchery incubator mesh, 2 frames and 4 pillars, easy to install. This fish hatchery nylon net is easily attached to the top of your aquarium..【Perfect for Pregnant Fishes】- This fish net can efficiently help you in breeding fish, especialy comes with 2pcs fish hatchery breeder box separation net can meet your needs..【Reduce the risk】- Aquarium hatchery incubator can reduce danger, that will prevent your fish from attacking the newborn fry in the breeding box. It is ideal to use for isolating diseased and weakened fishes. It also can protect sick fishes, small fishes or shrimps from aggressive large fishes.