Not really a "breeding" tank. Just my main reef tank which is a 75 gallon with 20 gallon sump, 440 watts vho lots of live rock and sand. some shrooms and leathers, and a few other fish. My clowns started spawning I did lots and lots of reading I mean LOTS. Then dcided to try and raise them. The hardest part is making sure you have enough live food for the larvae. Other than that it seems pretty easy so far. however I am starting to run out of room in my basement.