They should be fine. You might want to get 4 or 5 though because they like being in groups. Make sure your tank is established and you have driftwood and plants and lots of places for the loaches to hide, because they are shy and mostly nocturnal. Also make sure your water line is at or below the edge of your filter if you have a HOB filter- I have lost some loaches because they've climbed up the outflow of my filter into the motor blade.