It seems to be on the front only. I don't know if that was because there was algae on side and back or what. It isn't noticable when the tank is full. I would like to get rid of it though. I'll try the wine bottle cleaner. I alway considered myself as a wine bottle cleaner 
Thanks everyone
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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