Well, I am probably NEVER going to do another large water change ever again! After preparing 40g of water, in advance, matching PH, salinity, SG I did a large 40g water change last night. I did such a large change after reading so much about it. I woke up this morning and mmy turbo snails and two turtle conchs are all dead. But what is really worse is that for the past month or so I have been enjoying watching what amounts to literally a hundred or more baby trochus snails crawl around my tank and continue to thrive. Every single one was dead. I could not find a single surviving specimen. Fortunately, my fish seem ok, my BTAs appear ok and my corals, while they weren't opened up yet, also look allright. I'll know more later. Frankly, I am at a loss, and really disappointed right now.
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