I have three in a very large community tank and they are also large now and I have no problems with them they are ones I enjoy watching as they are active and yes they nibble when you put your hands in the tank.
They are with white clouds many types of tetras, swordtails, silver dollars,gouramis,bristle noses, clown loaches, kuhli loaches, cuckoo catfish,upsidedown cats, pakisanti loaches, sailfin mollies and many types of corey cats and I even have babies constanly in my weed. I just measured them and the smallest is 8cm in length.