for the outside, you can spray windex on the paper towel (just make sure you do this away from the tank so you dont get it in the water) and wipe it off that way. As long as you dont get windex in the tank you'll be fine. As for the inside, an algea scrubber or magnet scraper would work, but correct me if im wrong, but in sw
, dont you want algea on the back?
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