Albert,
I thought you might want to know how well Mag-pumps work with the Biozone 90101 skimmer that you sell. As you may recall I've asked you several questions about this pump in the past and you've been very helpful. Anyway, the Mag-7 is a very workable pump for this skimmer.
Lots of foam but the water/foam line needs to be within an inch or two of the top for it two skim. The mag-12 is incredible, depending on the organic load the water/foam line only needs to be a couple of inches up the column.
There is so much foam above which actually skims in the waste container. I would strongly recommend this pump it really makes lots very fine bubbles. The pump is submersible or external in-line and can be purchased for around $90 mail-order.
Thanks again for all your help.
Mike Hughes.