What do you run your PH at ? Do you use calcium hydroxide ? If so do you have trouble with it clouding the tank ? I don't run GFO , just not a big fan of it and I have not had any detectable phosphate in a few months . I do run a sulfur denitrifier . I did run ozone for awhile but found my orp was getting out of control . It would stay at 500 with no ozone , I figure it was hypo bromide . I went a saw Joes tank a few years ago . Nice setup . Do you run GAC , I just started using it . My softies hate it . Have you used lanthium chloride ? Nasty stuff .