good or bad algae?

[Myka]

The first pic looks like Caulacanthus ustulatus. Do a Google search to confirm. It's often easier to match the real thing to a pic, than to match a pic to a pic! If I'm right, then it's a nasty one to get rid of. Every little bit that breaks off will start more algae. So when you rip it off have a siphon hose there to catch all the little pieces. This is a good idea no matter what kind of algae you're ripping off.

Second pic is showing some fuzzy red turf algae on the left (different than the first pic), and there is two green algaes there, but they are both a type of Valonia sp bubble algae.

The third pic shows Caulacanthus ustulatus and red turf algae.

All algaes feed off excess nutrients. With this amount of algae growing in your tank you can be sure that you have plenty of excess nutrients. To learn how to get rid of these take a read through the link in my signature.