My favorite is the Hammer Coral:
And, Josh likes the Candy Cane Coral:
But, the "zoa's" or "zoos" or zoanthids are Josh's favorite:We also had them check the water while we were there and they told us it was perfect! >.< Even after the A/C in the house being out for a week and having some temporary troubles with some of the alkalinity, calcium and PH levels in the water. We've learned quickly how to remedy those. I have to give Josh all the credit. He's doing a great job; with everything else going on I just don't have the time or patience for it! LOL
Josh is on a new project of growing our own phytoplankton to feed the corals and he's having plenty of success with it. In fact, we're probably growing it faster than we can empty 2 liter pop bottles to keep the stuff in! LOL I'd include a picture, but it literally just looks like a bottle full of green water - not much interesting to look at.
Our tank is now 6 months old and at this stage it is considered to be an "established" marine environment. Albeit a newly established one, but we've made it that far and that's a huge accomplishment! It certainly hasn't been without effort, but I think it's been worth it! :)