Middle might be Blastos. I am still unsure so you’ll have to check to be sure. You would mix the reef roids in a small container with some tank water, and then use the squirted to slowly release the reef roids near the corals. Be sure to take it very easy on the amount of foods used. For three corals I would use half a pea or less
I think the ones on the bottom are clove polyps. similar to star polyps. both can easily spread throughout your tank. Many consider them to be pests. I know I do. They can easily catch what they need from the water column. I wouldn't feed them a thing on purpose. They'll spread fast enough as it is.
The middle one does appear to be a blastomussa wellsi. Small bits of meaty food occasionally and it will be happy.
The one on top I'm having trouble with. There's a bleached looking birdsnest? at the top left and then in the upper middle what appears to be a soft coral of some sort but I don't think it's a kenya tree.