Betta/fish community… Why on earth does this fluffy stuff keep growing off of my heater? I do two water changes a week in my betta’s 2.5 gallon; a twenty five and a fifty, a 100 every two weeks or so and despite constant efforts to clean the heater this stuff forms within a day or so. :/ betta is currently on some antibiotics for a rather nasty case of fin rot but otherwise a-ok and doing much better. Just scratching my head over this growth stuff.

could be fungus, or could be white algae (not sure if this really exists or not). i would say soak the heater in hydrogen peroxide for an hour and see if that gets rid of it.

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