I also been having this issue with my 5000's on my Euro-reef. I've been playing around with the nylon washers. There are a 1/8" and a 1/4" bushings shown in a diagram of a impeller. Mine seems to have just a 1/4". I've been told not all impellers have both washers, but I think I'm going to add a 1/8" also and see what happens.This is very aggravating so I hope this works.
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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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