Lately I have been getting a nitrate level of around 10 today it's closer to 20! I've never had this issue before I use a fluval filter but have had one for 7 years. I switched to sand bed a couple of years ago! Any ideas why it's doing this would be appreciated. The rest of my parameters are where they should be. I have a mixed reef with 2 percula clowns, green chromis, watchman goby. I have a Crocea clam, frog spawn, plate coral and a favia, and zoanthids, mushrooms plus cuc.


