The thing with at 10G is that its too small to get a good group of fish together. You need to pick fish that stay very small in order to get more than a few. Danios and white clouds almost need more space than a 10, but you could fit them if thats all that was in there. You could get like 5 danios and an apple snail...or 4-5 cherry barbs. You could go for a group of like 7 harlequin rasboras. Or 3 corydoras (kinds that stay small) and 3 white clouds? Just remember that you need fish that stay under about 2 inches, and most fish that size need to be in groups of at least 3, but better if its more than 5.