Quote:
Originally Posted by Delphinus
I beleive it is fairly typical... except for perhaps in more heavily fed tanks at least...
Yeah, I'm wondering about porosity. It's funny that you started this thread because I was basically wondering the same things and the thought had occured to me just today about the rock density.
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Well, I've gone through bouts where I've fed really heavy, no change in NO3. Maybe I'm just lucky?
I guess I bring this up now after that comment I saw, and the fact I need to buy new rock in th enext few weeks.