I currently have a 75 gal with a magnum 350 and a koralia 3 powerhead. I did my checks yesterday and my NH3=0 NO2=0.2 NO3=10
I do have one question. The other day, I noticed brown spots on my sand and on the tufa rock. I purchased 2 live rocks, one of them did have a brownish orange color to it, so i dont know if these patches are coming off of it. any ideas what it could be?
I am planning to get my CUC real soon, any recommendations on what I should get?