thinking about restarting.....

+ 1 on getting to the root cause of the nutrient issue. Also I would consider natural feeders on some of this stuff. Peppermint shrimp for aptasia and my one spot fox face is a swimming lawn mower on the algae. Mine will eat Caulerpa too.
 
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.
 
Update...

I got my po4 to .03 before adding GFO. I removed the sand from the 20L thats part of my setup, I think the old sand was part of the problem.
Add GFO yesterday and just did a test now. The po4 is 0. I will test every other day make sure it stays there.
 
Update...

I got my po4 to .03 before adding GFO. I removed the sand from the 20L thats part of my setup, I think the old sand was part of the problem.
Add GFO yesterday and just did a test now. The po4 is 0. I will test every other day make sure it stays there.

Isn't .03 about where you want to be? If you can maintain that without gfo, I'm not sure why you'd need it?
 
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