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There's one variety, the three banded sumo loach, that gets to a bit over 2 inches long, and another variety that gets to 4 inches. Both of which grow extremely slow. I recently moved some fish over to my 20 gallon. I think I might get some more into the 55I have had five for about three years now and I love them. I have never seen any aggression out of them though they don`t stack like other loaches. Mine are in a 125 hillstream tank and spend much of their time out of sight. They come out as soon as food hits the water. I wish they got a little bigger than they do but there`s nothing to be done about that.
I had hoped they would spawn but they share their tank with a bunch of barbs so not much chance of that. There is just no way eggs would survive to hatch. Great little fish.