Now that I'm experiencing the guppies famous enthusiasm for breeding, I've been thinking of setting up a guppy fry tank in an empty 10 gallon I have. I've been doing some research about fry tanks, and it's left me a little confused, I'm hoping someone can help me out. Cycling, how? I've read that you can't use an over the back kind of filter because of the current? So, what do you use? I've read about the sponge type that I think hook up to an air pump? Is that better, can you cycle an aquarium with those? Any help would be appreciated, thanks!