I want to switch some residents of my 15h. Currently have 4 guppys, 5 zebra danios, 5 otos, 2 green spotted corys, ghost shrimp and snails. I was looking to trade out the zebras for something that will fit well with the rest and not grow too large. They are just a bit too active and I dont think my tank is a good size for them. They are all full grown 1 -1 1/2 inches. Bio load isnt really a factor since I overfilter I just dont want it to be too crowded or lose any existing inhabitants to being food.