is the phos ban hook correctly ,
the intake should be the middle connection . the one that is not center is the out put. just in case .
can you get a pic of the complete sump from top view , so we can see what may be causing the bubbles
the red stuff , is red slime , it could be from , over feeding , nitrates and or phosphates. It would go away that fast. it takes time , some times 2 months with WC and changing out the media.
What i did to reduce growth when i had a problem , is shut the lights for 4 days. i did 5 gal WC about 2 of them , in the 4 days the lights were off. it help alot , but not the solution, just wanted to get control of clearing it from the tank
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