03-23-2011, 09:54 PM
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Yes, different species of rainbows will often school together. Not all the time, but often. I keep 4 species together in a 90 gallon - dwarf neons(8), boesmani(4), yellow(4) and turquise(4). The smaller groups will break away and do their own thing and meet back up with the others
Originally Posted by bettababy
Based on the description of your 55 gallon tank in your signature, I would say that tank is pretty full as it is. There should be no reason to add more rainbows if it means over stocking your tank. 5 is not a mandatory number and rainbows are not as sensitive to school numbers as something like neons or cardinal tetras would be.
If you'd like help with ID'ing your rainbows please post a few clear pictures of them. There are plenty of people here who should be able to help with that.
I have to disagree about a couple of things. First, I think there MAY be room for more rainbows, and that would depend on a few factors such as filtration and maintenance.
Rainbows have an extremely high schooling drive, moreso than any other fish I've kept. I agree that they are not as sensitive to not being in a school as other fish are, but I don't see how that justifies NOT keeping them in a proper school size. They are one of the few true "schooling" fish in the trade, in that most fish "shoal" because they have no where to go. Rainbows always have somewhere to go - wherever they aren't.