i have a sailfin pleco living with 2 clown loaches in my community tank with no problems. in fact, i appear to have an extremely friendly pleco...he feeds with all my cories and clown loaches, and lets the pick all the food off him that lands on him. its a funny sight watching him 'hang out' with them, as he is such a giant....but a gentle giant. i have heard rumours thou of clown loaches being rather tempermental sometimes...but i have never experianced this, and it appears no one else here has either.