Okay so, one of my fish has been itching quite frequently. I have thoroughly looked at all the fish and cannot spot any white spots on them. I'm freaking out because, I'm so new to this. However, the other day when vacuuming the gravel this white slimy stuff came out of the substrate? My pleco a couple of days ago also had a clear string hanging on him, I researched and thought he just might be shedding his slime coat. I don't know what I should do? Just to be on the safe side tomorrow I will slowly increase the temp of the tank up to 84. Only one fish is frequently itchy but I'm guessing this is a sign and I shouldn't brush it off. this sucks.