I've got a ten gallon that I have two male part Endler's/guppies in. Some friend bought these feeders long ago and when he moved, I kept them. They keep my Q-tank seeded. That's the best I can do.
i have a 110g with a guppy fry, he's livin it large the rest of the guppy fry got sucked into the filter :-(..and also a 40g with single cells organism,