Sure I can put a ton of rock in the sump as well. Haven't really nailed that down, but guess it would make more sense to open up some swimming lanes.
I'd like to have some coral, but I'd like for it to be more a mixed reef. Was thinking more of the Achilles in terms of having so much flow.
With the Prazi, just what I've used prior to the purple tang. Since I normally just bought fish from the LFS and I know they have had problems with flukes from wholesalers before.
Wasn't thinking of putting "a ton of rock in the sump as well" as much as INSTEAD of in the display. You'll be fine with a nice rockscape that is sparce as long as you have a good skimmer and because you are using a sump with rock in addition to the refugium. Regarding the high flow...you are correct the achilles usually reside in surge zones so yours should benefit from the high flow. Regarding the prazi...if you suspect problems then maybe I would advocate being proactive however I'd still like to be confident that the fish is eating well because if not the prazi will inhibit his appetite. Here's another question: if the LFS is known to have had problems...why are you purchasing from them?