I've been doing lots of research but seem to keep getting mixed advice on this topic. I currently have two 20 gallon reef tanks and a 75 gallon fish-only tank. My current interest has been to find any sort of invertebrates that could be successfully cultured in my aquarium. Does anyone have any suggestions from personal experience? I've heard that some cucumbers will reproduce via fission, as well and select breeds of starfish, but I am curious as to what species of inverts are most practical for aquaculturing?