Algae Growth Blocking HOB Output

never seen anything like that!
 
holy bajeebus! if it's blocking the output, what was stopping your filter from overflowing?
that is some serious serious blob gunk!
are you sure it's plant material?
 
HOLY !@#$ never seen anything like that before. My only advice and practical advice is clean often, very often so no build up. Hows your water params? stock? etc.
 
I think you're growing swamp thing in your HOB filter.

This is for sure.

the real question is, why have you waited so long to clean it? :)

This happens quickly, 3-4 weeks, it's blocked completely. I used to clean my HOB every 4-5 weeks just cause, and now when it starts back flushing over the intake, it's like "Whoa, it's been 3 weeks already?"
 
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