I like that tank, but...
I just rebooted due to majanos, full tank caulerpa, and bubble algae. Never had those problems in any tanks before. But, I had a 210 full of all of them! Lost almost all the corals in the process of trying to get them under control. I saved a group of rastas, and a few palys and guess what? I have majanos and bubbles growing in the 12 gallon nano set up for the purpose of holding them and a couple young snowflake clowns. anothing except the corals were transferred. It's about 9 months now, and I've been injecting 1 or 2 here and there since mid-summer. IMO you will have a few slip in as larva or so small you can't see them. They will be there. I examined the corals with a magnifying glass and couldn't see anything before I put them in the nano. I bleached all the rest of my rock for a couple months this summer, then hosed the sludge off, and soaked another month in fresh water changing the water a couple times. Next I moved it to a stock tank with RO for few days and a couple water changes before I finally mixed up the salt. That was September and it's been in my new 200DD for about 2 weeks now. There's no way I'd intentionally introduce anything live from the old tank, other than my fish, into the new tank. I'm even a little worried about them!
The equipment looks like a pretty good deal, the corals I'd have to think really hard about saving based on my experience. I sold the bare 210, stand, and canopy for $500 if that helps. I would seriously bleach every nook and cranny of the tank, sump, pumps, etc... anything that touches tank water and could have those little b@$t@*ds hiding anywhere!
If that sounds harsh, it may be, but I lost a lot of tank inhabitants I had for many years, try to imaging a brain about the size of a volleyball you've had for 8 or 10 years eventually dead, and covered with majanos. Not cool.