I have 4-10 gallon tanks for shrimp and small live bearers... my cherrys have been going for a while, and have populated a half dozen tanks, but the orange, yellow, and blue have been coming along slower... the blue and yellow seem the slowest, I think the blue are breeding, they are just not as brightly colored, so I don't think they are as visible... the yellow are very visible, and tonight I saw my 1st baby in that tank...