Hello I am new here and I have a 10 gallon tank I set up a year ago and all of a sudden my nitrates are at 80 ppm I do a 3 gallon water change weekly and have a 3 inch sand bed with a 30 gallon aquaclear and a 20 gallon aquaclear hob filter on it and 10lb of live rock and my cauliflower coral is shrinking what can I do??
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