[Kip]

if you make a big change like this, then the next day you can see ill results. I have no personal experience with that skimmer, but can you turn it down? If not, can you just run it part time so your tank can adapt? Or... you could always feed more (which is what i like about a big skimmer...allows you to feed more).

what you are probably seeing is the zooxanthellae affected by the rapid depletion of their nutrients (po4 and no3 via organics)