Hey pikachu
I've been replacing the nasty DSL roll, little by little and have been adding bio balls to my wet dry. I've got a 55 semi reef with pretty good fish load, so I'm keeping them for now. Once all the DSL material has been replaced, I plan to slowly remove bio balls a few at a time over the course of several months. I've got about 60 lbs LR too, and mixed coarse aragonite/sand substrate 2-3 inches.
So far my nitrates are between 5-10.
Plans are to completely remove substrate and go 4 inch live sand/sand/aragonite - but that project has been delayed a couple more months - still researching and reading.
Brian
[ June 20, 2001: Message edited by: broomer5 ]