I agree with Coryloach, the optimal temp for CL's is approx. 26 c (78.8 F) so best to choose from fish that are typically found at that temp range. I also second the person who suggested adding some PVC or ABS to your tank to give the loaches a place to feel less stressed. Larger loaches can take weeks, sometimes months to adjust to a new environment and a rather bare tank isn't going to help. Good luck, nice score.