The problem with doing a shrimp is Id have to use a sponge filter, Right? Now its a tank with a huge sponge in it... Great. also id need to spend more money to get a grow light. Im saving for my reef build. I have 2 10g with male bettas already.. I doubt this is possible, but would kuhlie loaches ( spelling :/ ) or botais work... prob not big enough right? gups or molls could work though right. Should I get a pair of gups?