#ed_op#DIV#ed_cl#Ihad a problem once that sounded the same as yours. i did the same as you are doing and as everyone else is sugesting you do, treat for disies but the scratching onrocks and the substratein the aquarium is usally a result of the fish being uncomfortable in its water suroundings have you checked every element of your water quality? sometimes with those sesitive fish the smallest change in water quality can make them go on a hunger strike from being stressed out and uncomfortable and with that many fish so close together will stress out the rest of them even tho they my be ok with the water how it is their nehbours actions and well being won't go unnoticed. your water may be fine but it wouldn't hurt to try a full master test not just your four basic quality tests. just an idea from experiance hope it helped out some. good luck its a very frusturating time when you first lose an jumble of fish to something like that. best of luck.#ed_op#/DIV#ed_cl#