I know the Tang police will be out ASAP. So here's my disclaimer...
I will be buying a house within the next year and when I do, I wil be upgrading my tank to a humungous whatever I can afford limousine caddilac of a tank. They will be ok.
As for the Sun Coral, I have only had it a short time. I was worried because it never came out, but I started taking it out of the tank and putting it in a bowl of tank water and feeding it boiplankton and brine. It seems to have really liked that and now it looks great.