You could try getting your own fresh water puffers, instead of catching them for your friends. As for clown loach's they will eat snails, also this is a fish that should be kept in groups of 5 or more. Also a fish friendly way to get rid of snails is to place a saucer in the tank with some food on, and wait for the snails to climb on the saucer and then remove the saucer complete with the snails on, which is possibly the easiest way to catch them. Also i dont like using a chemical to kill them off, as if you miss any dead snails they will foul your water
