Ok, good cause you can't even tell it is on there unless you stand at the side and look through the end, even then it just looks like a dulling of the glass. When I clean it off you can't tell a differnce from the front at all. I would say that if I wasn't so weird about it that I could wait about 3 or 4 days until you could start to tell. That is now though, durring the summer when I was having the heat problem, If I skipped a day of using the magnet, you could tell, of course my temp got up 85 several times and stayed around 83, it is now 78<a href=showthread.php?s=&postid=8559017#post8559017 target=_blank>Originally posted</a> by firefish2020
We all get algae on our glass it's just a matter of how much algae. If there is to much then it's nutrient problems. If it's a slight dusting, that's not a real problem IMO.