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I have an 80 gal. set-up that I purchased used last fall. Over the last 4 months my nitrates have continuously risen to around 30 - 30+. I was told that my crushed coral is notorious for trapping food and by vacuuming the cc, and doing 20-25% water changes I could bring the nitrates down. Have...

Hello everyone, am curious about the red algae, (I too am new to this hobby), is that what is on the glass of my tank...is red, circular, some are tiny red circles, others are larger...I have tried to scrape them off, but they are like cement. The only thing scrapping seems to do is make them a...