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The rocks are in the middle of the tank do you think they need to be pushed back? I was thinking it would be good to have flow behind the rocks as well and having them in the middle would help
I tried that logic myself, but eventually I wanted the space on the sandbed in the front so I ended up stacking rocks against the back glass. The only place I left open was the sides so I could get at them to clean. I do still have a cave system in the back that my fish love to hide and play in so it's not like theres a dead space back there. I have my powerheads positioned so that water movement is in the back as well.