Macro Algae and Amphipods

[prokhk]

I purchased some Gulf Rock a while ago, and with it came some cool critters and algae. Does anyone know what kind of macroalgae this is? I am also having some bubble algae issues, so I am planning on getting an emerald crab. If I do, should I expect it to start with the macroalgae first, before going for the bubble algae?

I also tried to take some photos of the amphipods that have taken over the tank. I think they are a good sign, and hopefully a tasty snack for a future fish.

Thank you!

 

[BristleWormHater]

Could you get a pic of that macroalgae in white light? Try to get a clearer pic of the branches as well.