my aro recently suffered some damage and today i noticed on my ck what looks like my pleco thought he was a lollipop. i bought some aquarium salt and it says to use 1 rounded tablespoonful per 5g, my tank is 90g so am i to use 18 tablespoons? this seems like alot of salt to me but i have never used it before. i am going to do a 50%w/c with stress coat before adding the salt. how long should i wait before another w/c?