Half of them are damsels; the other half a mix of large and medium.

Please define large? 6"? 12"? Other?

With 50 damsels alone, it's got to be pretty full.
Would like to see a picture.

I know my 12" Naso's seemed to be a little short on swimming from in my 7 foot long 400G tank.

I have zero notifications- I would log in and figured nobody had responded- other forums I've been on notify me via email or have a "!" of sorts when I log in. My bad-- I am going back now to respond. Good feedback here, didnt mean to seem like I wasn't reading it. There is also no "like" or "thanks" function like one uses in other forums to show that you have read the reply.

Thanks for the feedback @ali1; @Alfrareef; @McPuff; @Rover8; @lagatbezan; et all. Right now the tank is running with no fish, just some sticks (which I have dipped and observed in another tank for a while before moving them). I do have a ~60w UV on there at 250gph as a preventative measure, but I know that 60w is pretty darn undersized for the tank.

@rvareef; having 350 in the living room does not mean that I can put a quarantine next to it- would look awful. When I say no room, I mean I dont have a dedicated space to set up a 40b that would not look awful or interfere with daily happenings at my home.

@ca1ore; it is a 96x27x30 tall. Got it used (like new), if I personally ordered it I would have gone with a wider and less tall setup. Custom faux coral stand too. Ive added a bashsea smart series sump (which has proven to be a pain), Regal 250ss skimmer, apex 2016, Radion hybrid fixture, etc. A pretty sweet setup :)

@Crusty Old Shellback I use RODI and Red Sea Blue Bucket on my tanks, but thats sweet to have free access to good NSW!! I think hauling water in my coupe would damage the suspension though xD

I also have a very healthy, stable 70g reef. I wonder if I could do observation in that tank for two months before adding it to the 300. This would be to check that the fish is eating and healthy in a non-copper or low salinity aquarium before moving it. It wouldn’t ensure absolutely that it is absolutely disease free, but would be a pretty good gauge of health.

The 70 gallon is mostly corals along with a pair of clowns and a wrasse, which are pretty hardy fish. It wouldn’t be nearly as big of a problem if there was some sort of outbreak in that tank.

love the tank

I would advise setting up a temporary qt. I have to rip apart my 180 to catch all my fish after an ich outbreak for not treating fish in the beginning