Well ran some test with my tank after a 15 gal water change and found my Nitrates at 40! Have a 90 gal tank with a 40 sump. About to get new light for coral on my tank. I'm hoping you guys have some suggestions? I could do water changes but All my other test ran smoothly and I only have high nitrates. I'll be wasting all my other levels if I just dump out the water but If that's the only sure way then I guess I have to.:help::help::help:
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