Tetra Ph Range. Cardinal tetras are happiest and show their best coloring in schools of at least six. Ammonia should be kept under 2 ppm , though even 2 ppm can be harmful.
Since the bloodfin tetra can endure such low temperatures, it is commonly found in unheated aquariums. For neon tetras, despite being freshwater fish, they thrive best in slightly acidic or neutral water. Tetras are freshwater fish, but they can adapt to other water.
Tetra Fish Reproduction. You keep them in a tank that does not contain any ammonia and nitrites. They will usually spawn their eggs in the morning, so if you want to watch them spawning, just stay around the breeding tank after the lights turn on.
Being descended from the caracid family they are very easy to breed, however before laying a large aquarium is. If you didn’t notice neon tetras breeding, adjust the condition inside the tank If the fish are engaged in courting (or even spawning) in the community tank, then they are ready to breed in the spawning tank also.