I second the sparkle eye white clouds. Also, embers were mentioned, they are awesome little guys. Also, there are scarlet badies, jellybean tetras, clown killisfish, Norman's lampeye killifish, chili rasbora, dwarf spot rasbora, green neons, phoenix rasbora, emerald rasboras, pygmy sunfish, least killifish, Endler's livebearers, dwarf anchor catfish, dwarf cories, daisy's ricefish, sparling gouramis, betta (there are many species other than just the commonly seen Betta spllendens), shell dwelling cichlids, celestial pearl danio, dwarf puffer, fw bumblebee goby, oto, ruby tetra, blue neon rasbora, and yellow neon rasbora. Some of these have been mentioned before, but I threw them on the list just for the sake of being thorough. Also, there are even more microrasboras than the ones I listed. Keep in mind that not all of these species are compatible together and each one needs to be researched to make sure you can meet it's needs.