Python water changer has mold?


I just noticed that my python water changer has mold? Mildew? I’m not sure but it’s something! It’s black gunk on the inside of the clear tubing, it’s only in a little bit of it, like maybe 6inches and the rest looks fine. Will this hurt my fish? Is there a way to clean it out?


I have never found it to bother my fish and Ive been using a python with a tube with mildew/mold in it for years. If you want to clean it out you can try soaking that area of the tube in hydrogen peroxide and then rinsing it. But I don't worry about it personally.
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