Help! What does this reddish color mean?

I just changed water last night. What is this color on my roots? Is this rotting??

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Bacteria build up among other things. Its not bad just wipe it off when you clean the unit inbetween grows. It varies in amount ive never had that much but likely my setup


roota that big dont like light. Hope you dont look too often.



(If you don’t feel slime on your roots, then you should be fine): (#Slime):