BACKGROUND: I donated my fish today (except the clown pleco), in exchange for one Angelfish, and I had my water tested. Just a couple questions... 1. My hand slipped during my last PWC yesterday. Will overdosing with Stress Coat+ cause false readings with my water? Today it tested 0 (Ammonia), 0 (Nitrite), 0 (Nitrate), and >6.0pH. I know Stress coat softens water and binds ammonia, so is this the problem? I've otherwise done nothing to upset the cycle of this tank (unless moving all the fish at once caused it :-\) 2. My LFS told me my angel will be alright by himself (aside from the clown pleco). I'm backing myself up with agabr123's stocking suggestions for a 20 gallon tank (yes it's a tall tank). If there are any doubts, please let me know. I will be upgrading my filter soon to an Aquaclear 30 or 50... EDIT: For the pH, my LFS sold me Alkaline Buffer by Seachem, because my pH is at risk of fluctuating. She advised me to add it in small amounts because my angel enjoys soft water.