Nice. That's more nitrates than I thought you had but I guess that helping some of the deeper colors that you're getting. Do you have an cyano with this balance? I have to get that ARC fireworks. I always like that piece.Thanks Rich, nitrates are 25 (Salifert) phosphate is 0.02 (Hanna) I run ROX 0.8 carbon and GFO in the same mesh bag in my sump. I don't change it unless I see an issue.