That is a pretty good point you make about the possible nutrient build up in the back behind the rocks. I would be open to the idea of moving the rocks forward but honestly there is no room to move them forward. The tank has very little space for adjustments and the rocks aren't glued down to each other so I can't get them to stay unless they are leaning against the glass. The other thing too is if there was a big nutrient build up behind them and I moved the rocks and let water flow more freely through it, couldn't that cause a potential spike in P04 and N03?One other thing I see that could cause an issue would be that it appears your rocks are up against the back glass, that can restrict flow behind the rocks and create a nutrient sink as well. So maybe slide them out away from the glass so some flow can get back there and kick up any detritus that's hiding from you.

im blushing
what are you numbers.......
a lepto

