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If you are worried about that yellow stuff, shake the duncan until it retracts, take it out of the water and brush the stalk and plug clean with a toothbrush.
But, if you are overdue for a wc, could be you've just let the tank go south.
Do a deep clean, some regular water changes and see if you get any improvement.
Maybe harsh, but it could also be your lights are crap.
Could be many things.
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