If you could move some of the nice corals you have then do what ever you can like people said above..if the 75 gallon tank are good enough to handle all your corals.
- If you are tired of fight those pest and bad stuffs in the tank then restart all with either cook rocks, clean the sand or buy new rocks and sand.
- If you are still have energy then try BRS GFO (Myself I don't like it because the brown stuff in the sum, it's work for me but not much as carbon dosing like Vodka or Vinegar)
- Gelidium, Bryopsis, Green Turf you may get away from them
- Aiptasia if not much then manual kill them with Lime Juice mix with Kalkwasser.
- Other pests in the rock I don't know which you need to find down.
You can try anything because you are back up all the corals already..
Restart the fresh new tank may faster than fighting with all bad thing in your tank, so think about it.
I am holding some corals (high end) for a reefer right now in my tank till after his tank restart and stable..
Good luck.