Nice looking discus! You need to fatten that pigeon blood up some. Lots of frozen bloodworms!! Ramshorns will not harm your discus. Too bad you didn't hold on to the clown loaches a little bit longer, but if you dont want a snail infestation, catch them now and take them out! How big are they and did he give you the names of what strain they are called? And I'd lose the SAEs too in favor of a bristlenose or a rubber lip pleco.