tank is 75 gallons. 3 fish . 20+ corals. we have had the tank up and running for about 9 months+ (not including the cycling phase). in the past three days I have done 2 water changes. im scared to do another because I hear I can remove "good things". but I can't get my nitrates (40ish) and ammonia(.50) down. I did have 3-4 coral deaths. I left my tank for a week with someone to just feed the fish and also add water to water topper if needed. and my torch for example is hanging on for dear life. and a couple of other corals have very visible exoskeleton.
I also tested alkalinity which was 8.1 dkh.. calcium 390 ppm ... magnesium 1400ppm.
anyone have any ideas on what I can do?
I also tested alkalinity which was 8.1 dkh.. calcium 390 ppm ... magnesium 1400ppm.
anyone have any ideas on what I can do?


