As already mentioned, test phosphates too. Make sure your rodi water is reading 0 tds on output. Before trying any of the remedies listed above, I would recommend that you try and track down the source first. Otherwise is could be a never-ending uphill battle. Have you added any new rock or substrate lately? Do you feed heavily? Excessive nutrients are caused by over feeding, most of the time. I would have your water tested by using better test kits - red sea, salifert, etc. Your lfs may have this service available.
Once you have verified your water parameters and checked your rodi system, then I would get a gameplan together. It would be a waste of money to go out and buy reactors, pellets, vodka, etc at this point - imo.
Once you have verified your water parameters and checked your rodi system, then I would get a gameplan together. It would be a waste of money to go out and buy reactors, pellets, vodka, etc at this point - imo.



