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I've had my nano skimmer for something like 4-1/2 months on a 30 gallon cube.

I have noticed the metal meshwheel seems to be worn down quite a bit compared to when I first got the skimmer.

For the first few months the skimmer was noisy and skimmed very well. I had to raise the skimmer to the highest position to avoid overflowing the collection cup.

Now the skimmer is silent and I have it lowered to the lowest position in order to produce any skimmate.

I will e-mail EuroReef about this. I don't know if this is a common problem and I don't know if just the meshwheel can be replaced or if I need a whole new impeller/meshwheel unit.

Overall I have been happy with this skimmer and it is a huge improvement over my Tunze Reefpak which I have been meaning to take out into the back yard and shoot.