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Just scrape it off with something like a toothpick, butter knife, or anything hard with an edge or point. It's just a combination of mineral deposits as well as other stuff in the water. Nothing that will harm the fish.
Alright that is good to know, cause I always get that on the edges of my tank or on my filters because I have well water here and there are ALOT of minerals in my water... no chlorine which is always a plus