1. M

    Sump Biological Filtration Suggestion 200 Gallon

    Hello forum members. I don't know if this is the right subforum but It seemed the best fit. I converted my 200-gallon reef to freshwater planted. My question is for those with a large tank and sump. Which biological media are you using? Thanks ahead for your input/suggestions.
  2. S

    Biological filtration

    Hello all! I need to get some new bio filtration for my fluval 306. The fluval medium that I used last time seemed to really hold on to nitrates. What do you all run in your canister filters? I was going to use lava rock because I have it on hand. Rethinking that one.