Hello,

a) photo 1 refers to a sea squirt;

b) photo 2 and 3 are sponges;

I agree with Carmen; the first one is a sea squirt (Tunicate) and the others (2 and 3) are sponges, pics 3 could be Amphimedon

I agree the point of Dr. Carmen Santos and Dr. Jorge

1. Ascidian

2. Sponge 

3. Sponge 

But only one ascidian in the 1st pic., but it is not in a colony.

I agree with the previous answers. Additionally, the light brown honeycomb shaped "turf" growing around the dark brown sponge, is a colony of bryozoans.

Thanks for all your help.