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Sand and rock can bind phoshates, but not nitrates. Those are just in the water. Water changes, big ones.
Get rid of canister.
Too many fish, including two that shouldn't be in a 75 gallon anyway. 10 fish is too much, and the blue and sailfin tangs need a tank that's 3-4 times that size.
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Pat
Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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