It's like a thin chalky layer of it.... it will come off you scratch it.. but I want to know if it's bad for my fish? How do I get it off?On my tank walls, there's this thin layer of scum...?
These are simply harmless mineral deposits, they often form near the water surface into what it known as a 'tide mark'. They often occur in hard-water areas or in tap water that has a high level of calcium.On my tank walls, there's this thin layer of scum...?
its fine just get a pleco they clean every thing
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