I messed up. Need advise on coral dip.

[Jaag]

So I had a bunch of flatworms in my 10 gallon tank. I mean a bunch. I treated them with Salifert Flatworm Exit. I sucked out worms before I treated and after. I sucked all my sand, blew my rocks off sucked up what came off of the rocks etc. So during all this all my corals (mostly softies, a few LPS, zoos and a rainbow nem) all were looking just fine. I did a big water change and I wake up the next morning and everything looked like crap. I waited a day and everything was on the downhill. I don't know what I did wrong.

My last resort was to put my stuff into my friends (a good friend) tank. I did just that and about instantly everything started to look happier. I am just a little bit worried because he has some aiptasia and majano.

I hooked up a big carbon reactor (for up to 300 gallons) and I am going to let that run for a week before adding anything to my tank. I just have the rock, sand, a toadstool and a couple mangroves in the tank.

So here is my question. Once I get my corals back I want to really make sure no unwanted pests are on any of my corals and get into my tank. What should I do to make sure of this? I want to know what coral dip you think. I am thinking Bayer. I know people are going to tell me to QT but that is not an option for me right now.

I would really appreciate help. Thanks guys.
Here is a pic of my tank before the "crash"

 

[Zero Nitrates]

Beautiful reef @Jaag

Everything should be fine. They are most likely just stressed out.

Best case scenario is that you have a coral quarantine tank, which is not an option for most of us. Another option is to practice a very thorough process when adding new coral.

First cut off the plug or as much rock the new coral is on. Many pest and eggs can hide in plugs and rock. Bauer, Coral RX or Revive all work well. I use Coral RX most but have used them all. Then dip the coral in a clear container that is placed on a white paper towel. This will let you observe what kind of critters are killed. Shake the coral in the dip to jar any critters loose. Rinse the coral.

Add the coral to your tank in an isolated area something like a frag rack not touching the sand or rock. Repeat the dipping process every week for three weeks. Then place the coral in your rock work.