Couple Unkowns

[Ryan]

Can anyone tell me what these 2 things are. The first one I am suspecting is some type of Nudibranch or sea slug. Its not very long, only about 1/4" tops. Green and yellow in colour, I am sorry for the bad picture.
http://i53.photobucket.com/albums/g79/Ryan_GSP/15%20Gallon/100_3633.jpg

These just started to show up one day and I am seeing more and more. I pulled one off the rock just to see what it was and it almost felt like a hard sponge when I squished it. Almost looks like a fluffy white sea squirt but I am not sure. The rock are usually not that bubbly, I had that piece out to mount a Zoanthid frag.
http://i53.photobucket.com/albums/g79/Ryan_GSP/15%20Gallon/100_3635.jpg

[noirsphynx]

Can't tell you anything about the nudi but the others are pineapple sponges, harmless filter feeders.

[reefy]

yup agreed the white ones are pineapple sponges I have tons in my sump, and they are totally harmless