Yeah it looks like algae. If your tank gets sunlight from a near by window, that could be a problem for the algea growth. My thermometer gets a lot of algae too because it gets the sunlight. Also maybe if you have a plant light, maybe dont keep it on as long so you dont grow too much algae. You could also get an Otocinclus. Just one though. Theyre the best algae eaters.
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