deffinitly clean the back. For many reasons too, first off, all reefs look way hotter when clean like that. second off, I believe that you get a better light value when the light is reflected off of clean glass back into the tank then absorbed by algea. and third off which is the most important one is that if you dont clean the algea off of the back wall, you will end up having algea grow, die, grow, die, grow some more and die some more meanwhile creating unexplainable levels of nitrates.......yeah, I clean the back wall of my tank for those reasons.
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