Originally Posted by papajuggalo
I apologize for the off subject question. Are the spots on the glass algae? If so does that become a problem over time?
Yes, algae, frog poop, and general assorted slimes. Those side walls have deliberately NOT been cleaned in two years now. It serves as a visual barrier to the frogs next door. I don't clean the side walls on any of my breeder vivs. I save that for my displays.
It has nothing to do with LEDs. It will grow/form over any viv over time if you let it. Sometimes it wipes off quite easily. If it's been there a really long time, it may take a razer blade to scrape off dried spots.