As far as my statement concerning huge flow, I guess I really made that statement from ignorance. Now that I realize my MRC skimmer doesn't require 1800gph, that changes things a bit.
It appears that due to the weak pressures with the Mag18, the skimmer requires that much flow to operate properly.

If my skimmer will operate on a BlueLine 55, I should be able to get enough turnover back through the returns with a BlueLine 100- wouldn't you think? Keep in mind that I have 1-6080 Stream and will be adding at least another 6080 and more likely a 6100 so I don't need a ton of flow back to the tank.