I picked up a gently used 29 biocube last week. LOVE it! I had read on another forum that I should take out the bioballs and replace them with rubble rock. I did this tonite, its not crammed in there full, but its about 3/4 full with decent sized pieces. Its VERY NOISY!!! is this normal? should i have taken out the balls? I heard they were just dirt mongers and that rubble rock wouldnt be so bad. Any advice/suggestions? did i do the right thing? can i put some filter floss over the rocks to try to silence it up a bit? thanks!! Sue

