Mostly they need warm water. They are not too fussy about hardness, but I would add RO if my tap water was really hard.
I couldn't get them to breed at any temp. below 78F.
They get bigger than any other BIV I have kept and are very showy, with big, full fins. Males close to 3" long as I recall. IDK how young they will breed, but most coastal Aphyos breed while still pretty small.
Wright
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