Can someone id this for me please?

[minitrucke]

Ahoy hoy! My dad picked this up for me today. My friend said that it has some great looking zoos on it but I want to know what the green stuff is and the plant like stuff as well. Have any ideas?
Also, What do the zoos eat and how do I feed them?
Thanks alot, Josh

 

[dmill15]

the plant like stuff is halemeda and the green stuff is a type of bubble algea.

 

[beth]

The halemeda is nice and you can keep it under control with regular trimmings. As for the bubble alage, I'd remove it. It is very weedy and could become troublesome for you.