A 50 is a blenny and goby tank; or clowns with nem; or others may offer combos that have worked well. Your ideal fish max at about 3-4 inches, and most of those are caught as adults, so WYSIWYG on the fishes. Providing an environment in which fish can have a territory and you can watch the community interact is rewarding... behaviors are interesting in themselves. Color can be come by: the midas blenny, or yellow watchman goby is bright yellow. SMall gobies come in barber pole stripes. A single yellowtail damsel will fit and is bright blue. A dwarf angel is a possibility if you have no corals. I'm sure others can provide other examples. Go to one of our sponsors and look for fish that have an adult size in that range, then consult one of the compatibility charts or ask around. I ran a successful 50 with blennies and gobies, dartfish and small jawfish.
