I've seen worse that have made it, and out of all of the carpet nems, I think you have a really good shot with the haddoni you picked up. it's showing a presence of zooxanthellae since it's not completely white, so with some food and decent light, I think it'll be fine. I'd personally place it in the tank with the halides but also depends on the tank conditions. Whichever one you can keep most consistent, I'd put it in that tank. Good luck!