Anyone else have this and is it normal? I am used to getting algae on the glass but for the last week it is accumulating quickly almost daily. The only difference is lower tank temp and been adding fresh hatched brine(oh I went from doing wc every 2 weeks to every week, also). Its only on the glass. Not on rockwork or sandbed. I have been doing a 20% water change every weekend because I don't have a skimmer and feel better doing more frequent waterchanges. Test are all zero but can't test for phosphates till I get another test kit.