Marimo Moss Ball/moss ball and java moss

You need to switch the incandescent bulb out for a screw-in CFL, but other than that, you should be fine. Both are easy to take care of.

Marimo does require some maintenance - you should squeeze it to knock out any debris it might have caught, much like a sponge - I usually do this with every few water changes in the bucket.

java moss is a little tempermental about temperature (around 77F at the most) in a small tank like that. It looks and grows differently than marimo or other moss balls. java moss is more like a vine than a moss, while marimo (i think) are soft and carpet-y. Java moss attaches itself so most things (large gravel, some rocks, driftwood, fake plants) and grows like a field instead of a carpet.

I actually dont know very much about the other types of moss so i would encourage you to do some google work and find out which type of moss you like best, and what is suited to your tank/inhabitants.