Absolutely beautiful fish. You've clearly given them a great home, they want to have babies! Your 300g is beautifully scaped too.
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Are these different species or just color varieties through selective breeding?
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There's only two species of discus in the wild, one I think has a few subspecies. I believe the majority of discus bred in captivity have come from one species, Symphysodon aequifacsiata... it's been a while since I have been "involved" though. My brother and I as late teens were a tad obsessed.
I never had anything fancy, personally since I was a broke teen but did give them a go. I do miss them and hope to have a small shoal again some day. I would want a house first though... I have one 38g and one 5gal tank and they are a pain to move with, I don't want to think about moving a bigger tank... not sure my landlord would approve of a bigger one either..