I would clean it all the way to the white.
I would clean it all the way to the white.
Cycle? No, you can't have a cycle on a screen. Cycles are caused by excess dead stuff in your tank, such as killing lots of periphyton by moving rocks around.
Blade yes, if needed to get to the white part.
I don't think shrimp are contributing, however adding a snail would not hurt, to break up the organic particles further.
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