Wow, this sucks, I feel your frustration! In my opinion you should ditch the canister. They are ok for fish only but personaly I would never use one on a reef system. Nitrate factory. Open a window or two and get some fresh air in, this will help raise your Ph some. I am thinking you may have too much bio-load for a 75gal. What with the population explosion of your snails and the 7-8 fish your filtration can't keep up. Also, invest in a RODI system, you may not be able to taste metals... but they are there. Hope some of this helps and good luck!!
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