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Hi guys I've been having a problem with my tank. Long story short, it had been stable for a year but I'd never done water changes. I put in a sand sifting star which I think released loads of nutrients that had been sitting in the sand. (I posted this problem on the forum a while back so thanks...

Hi! I have a 400L reef tank, set up using live rock and sand but no filtration. It's been running about a year with absolutely no problems, and everything appears stable. I have 8000L/hr powerheads, protein skimmer and wave box. There are some inverts, and about 8 fish. I haven't done any water...