I finally bought some guppies. I bought 3 females on Wednesday and 2 males today. The males are so pretty I think. Now the tank is so active! They are always swimming around all the time! The tetras just like to lurk in the plant forest and come out only once in a while. They don't swim as fast as the guppies. I might get 2 more females because I think the males are harassing the females too much.