There are different requirement for breeding different fish. Clownfish is one of the easiest. This post serve as an overview on each process. I think we can roughly break it down to 3 or 4 major categories to talk about. 1) Phytoplankton to feed rotifer and/or commercial Rotifer food to feed rotifer 2) Rotifer to feed larvae 3) Rearing tank and the related equipment such as air pump, light, sponge filter 4) Feeding procedure and technique I'll update this post later on to link the above 4 points into each topic. If you want to read more, a book called Clownfishes - A guide to their captive care, breeding & Natural History by Joyce D. Wilkerson is highly recommended.