I have an evolve 8 and i put a single fish in it, a tailspot blenny. He is always in a ho
;le in the rock so he doesnt swim anywhere, lol, perfect for an 8 gallon tank. Depending on the fish you might be able to get one in there. I am going to concentrate on inverts in mine which is another option.
I also have a 29g biocube which is such a great tank! Easy to maintain and you have soo many more fish options! You still have to stay small fish wise but you can have several fish if you choose right.
Good luck and hope to see how well you do.