My tank is labeled as tropical/semi aggressive, but i keep it at about 21 degrees, my fish are actually rather tame for being aggressive, I've tried to feed them feeder fish and the feeders ended up not only NOT being eaten, but growing up in the tank and getting very fat and having babies.... sad... anyways, i have a small school of tiger barbs, a medium to large tin foil barb, bala shark, red tail shark, angel fish, a knife fish and some kind of large tetra i can't remember the name too, i do have a small talking rafeal catfish, but he is very small and fast, catfish really can't be harmful to other animals until they're bigger. When he get's large i'll have to move him anyways in case he wans to suck on another fish while it's sleeping...
But now I'm worried about snails, and you're right, those gills might look like some type of algae to the fishies, i wouldn't want either of them harmed.. I have a 20 gal show tank i could maybe set up as an axie tank, i think that could comfortably house one.. do they do better in communities?