I am in the process of removing the bioballs in my 90g reef tank. I was told to remove one handful a week until they are all gone. I am doing this because I can't get my nitrates below 25. It has been as high as 40! My corals are not going to thrive until I get this number waaaayyyy down. My question is: What do I replace the bioballs with if anything:squigglemouth:?


