coral id & help

So I found this the other day not sure what it is the polyps are yellow in the centre it was on the bottom of a montipora capricornis

I got this coral from my LFS last night and was told it is a brain coral but I'm not so sure it is. Also, it's very pale pink in color, is it healthy?

This coral (i assume) hitchhiker came with a piece of rock i bought the other day and i'm not sure what it is. It is mainly a browny colour and then has white tips at the end of each 'tentacle' (not sure what the proper name for them is). To be honest i just want to make sure its nothing...

Not sure what this is. I was told a chalice? The dots are lime green and the rest is moslty white

Hi everyone. Always wanted to try a reef tank....more to it than I imagined. Going slow and easy some mushrooms and ricordea doing well. Tried a euphyllia that looked nice for not much money. It was doing ok I think till back to back disasters....caretaker error & 4 day power outage....well it...