Too late, these are the only reason why I'm getting into saltwater. Gonna do my best to learn about the environments and just get the tank as close to natural as possible. Would you recommend a sump, hob, or a cannister filter for a 20 gallon hexagonal reef tank? I'm completely new to this. Thanks for all the info.Don't get unrealistic ideas of breeding because some have managed to breed clownfish. Breeding marine fish is a complicated endeavor, do some research into how the big boys that offer captive bred fish actually do it. There have been a few here that fantasize about breeding other predatory fish, and that's all it will ever be.