What type of fish or other, can I add to my 5.5 gallon fry tank that wont eat my fry but would help keep it clean? I don't have an algae problem in there but I need something to help me keep the tank clean in between water changes. such as with uneaten food and such. I had 3 ghost shrimp in there but took them out cause they were trying to eat my guppy and mollie fry. I literally had to stick my hand in there and pull a shrimp off one of my fry.