I have a poorly tank, thread is in the sick fish subforum, but an interesting question arose today when I tested my water. I put my first dose of melafix in the tank yesterday and found that for the first time EVER my PH is lower than usual. It's always 7.6. Always. Without fail. Today it is 7.2. Does melafix alter ph levels? It is the only new thing added to the tank in ages. Since yesterday was only day 1 of a 7 day treatment, what is 7 days worth of dosing going to do to my PH levels? Anyone with any experience or advice? Or reassurance!