There are so many thing you could do there are alot of options with a 125 which I'm guessing you have since you used it as reference if you like sevs go for a severum community I had a tank full of gold severums and they got along fine mild aggression and most just dominance so if you wanted to do all rokteil severums go for it it would work I don't see why it wouldn't but to just put something out there no one else has you could maybe do a tank full of geos I would suggest altifrons or one of the most gorgeous geos redhead tapajos they also stay smaller then altifrons so you could fit a few more in the tank
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