will have different kinds, chaeto is an easy one to take care of, looks like a green ball of spaghetti. I grow ulva which looks like lettuce, there is also caulerpa types that are popular. You could even do mangroves as long as you have the room. Reefcleaners usually has a good selection during the spring and summer and liveaquaria has different types also. Ordering macro algae online is pretty easy and most of them transport very well, just be aware that you may not be able to buy or get certain types delivered depending on which state you live in.