unidentified corals on live rock

[mysis]

i got some corals on some live rock today, not sure what they are can you guys help me identify these. i also had some crabs that didnt come off when i cleaned the live rock and i was unaware of them. 1 of them is a sand kind of colour and kinda hairy nippers and 3 cm across. the second is a blacky kinda colour and is about 5 cm across. do i need to feed these corals anything in particular or they fine to be just left alone.

thanks, ill try post some pics of crabs

 

[mysis]

bump

 

[mogurnda]

The first one looks like zoanthids, maybe palythoa. They are usually easy to keep, as long as there is adequate light. They can be fed small, meaty things, but will do ok without direct feeding.

The second thing looks like a sponge to me.

 

[BBN]

I'm guessing the second is a sponge also. I have that stuff on my rock also. Looks like yellow slime on the rock.