White substance appearing on air tube. Anything to worry about?

Tobecobe
Tobecobestarted grow question 4y ago
Roots seem clean and there doesnt appear to be anything in the res, but a white substance has began to form on the aquarium tube. Theres definately no light leaks in the res. Anything I should worry about?
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Hempy_The_Kid
Hempy_The_Kidanswered grow question 4y ago
Hard water calcium build-up. Should be fine unless you want to add filters on your water source.
Organoman
Organomananswered grow question 4y ago
Correct, just dried out nutrient salts/calcium due to evaporation. Nothing to worry over.
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