deansreef, you will need to change the plumbing and placement of that skimmer. With the drain going "up and over" into the sump you are actually going to have the water level in the skimmer right at the top of the riser tube. There won't be any room for foam to be produced. This could be solved by either a) elevating the skimmer so that the drain is above the sump water level and is draining "down" into the sump or b) placing the skimmer in the sump raised up high enough that the drain is at the water level. What you need to acheive to get that skimmer to perform is to not have any (much) back pressure on the drain.
Sorry Anthony if I stepped on your toes answering this one. Figured you could use a break for a change.
