When you put your live rock (good coralline growth) in your tank. Use a tooth brush on the live rock to add in the release of spores to colonize the other rocks
Check with your water supplier. If they are using the newer chloramine method of treating tap water. Boiling will not remove it. That may have been the problem with the dip
It’s obviously in your drain system. Start by making sure the ribs of your overflow box are clean and you have no buildup of algae that are raising the height of the water needed to dump into the box
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If the tank is healthy looking's try to carry over as much water as possible.
If you can make or buy fresh ro water you are better served making your own saltwater