Interesting observation after recent water change: there is a perfect horizontal line (as if tape was there)- on glass where water change level was, below abundant new algae growth, above- clear as if recently cleaned. Never witnessed this before-- any thoughts??- guessing something to do with exposed glass above water line during water change process
The horizontal algae line you're observing on the glass after a water change is likely due to the sudden change in water parameters. Algae thrive in stable environments, and the disturbance caused by the water change might have created conditions where algae growth is more favorable below the water line. The clear area above suggests that this part of the glass remained dry or was cleaned during the water change, inhibiting algae growth. If you're struggling with your assignments like I was, you should check out
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