Berlin skimmer
 

Red Sea Berlin, pre-turbo variety, no pump, $20.

Hang-on tank model, although I used it in-sump.

I used this for quite a few years and as recently as last year on my ritteri tank. Seems to do OK on a mag7, I don't have a mag7 anymore, so can't include it, sorry, 5 years and it finally wore out. But hey $20.

Sold!! Thanks