Does anyone experience problems with flakes of seaweed Nori getting stuck in and on the blades of thier powerheads and lowering the flow ? in my case substantially ...
Would there be any solution to this , I'm running 2 x hydor koralia 7000's ?

Thanks Graeme , these are really annoying me at the mo .   Every time they slow down i have to stop and restart them to clear the algae from the head .