I would not keep less than 3, like many loaches they're social. I'm guessing a 55g 4ft tank is a minimum for 3 & a school of cool temp "dither fish".
They do prefer cooler temps, in the low 70s.
They're peaceful community fish, and cute as can be. Not sure if they're compatible with your other loaches, as I have never put mine with any other loaches. Maybe someone else here can answer that one.
Since I've added them, I've lowered the tank temp to 76 and everyone is loving it.
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