Hmmm Yes pests would be the first worry.
Your tank seems pretty big..but have you considered adding the cons about mixing softies with stony? That should be the second worry.
Since you are going to add stony corals, you have to ever more careful on pH, Alk, Ca , Mg and PO4....measure them before adding the corals and moniter continuously and rectify as needed. All of them has a chance of declining. Would be wise to check for Ammonia also in the beginning days of adding the corals.
Adding a lot of corals especially softies at a shot even in an established system can lead to problems...so thing is to keep eyes open for any alarm signals and be always ready with prepared saltwater.
Just a suggestion, why dont you setup a quarantine tank...and put all these corals in there and slowly transfer them few at a time on a weekly basis into the main display tank....helps prevent the unnecessary stress on you as well as the DT...
Good luck and would love to see some pics of your collections....