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Does anyone have one of these. If so how in the hell do you put the stuff in the back. I have a oceanic but its different. the bioballs have water trickle through them. The nano cube loooks to me like the bioballs are completely submerged. But maybe Im wrong. anyone please can tell me how to put the filters in. I have 1 coarse filter block, and 2 finer filter blocks. are the suppose to go all the way up to the top of the overflow?