Dead clown fish, and a stubborn Duncan coral

Il make this short and sweet and i appreciate your insight. i got home last night to see one of my clowns laying near the bottom, almost on his side looking unhealthy of coarse. gills pumping rapidly, i started to feed my tank as i always do. and the clown seemed normal, swam to the top and acted just fine. Later after the light had been off for about 2 hours it took me 7 min to find him. squeezed himself under one of my bottom liverocks barely breathing, i easily scooped him in the net and threw him into quarantine, he didn't look healthy, no works or parasite though, but he was seldom swimming, and he didnt make it through the night. water parameters all test fine. 29g high setup for 2 months.
As for my duncan i thought he died after i brought him home from my lfs but he was just retracted in. He came back on 2 days ago buy not totally, like half way, not sure what his deal is maybe to close to the light? I appreciate your help.

 

Sorry about your clown How long had you had him?

Where in your tank is your duncan located? They do prefer less bright areas and lower flow.

 

Perhaps internal parasites? Not sure how you would verify. If that's the case I've heard of a special food that is supposed to help (flake food with antibiotics I think) but it may not be good for inverts.

 

duncan is placed low and not much flow. hes not opening alot like he looked in the fish store. The clowns Ive had for over a month.