I have GBTA and RBTA and they don't sting each other, so you should be ok with those two touching each other. The others I would think you wouldn't want touching.
Plus a carpet is gonna get kind of big for a 40gal.
Full grown carpets are like 3', and a sebae is about 2', so I'd pick one or other.
Actually I'd probably just have BTA's in that size, maybe a couple mixed colors.
I wouldn't want diff species touching.
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