Either way it should survive in your tank. If it looks like the ball has short green rabbit fur, its a true Marimo ball. If it looks like a wadded up ball of strings with tiny leaves, then its a wadded up ball of Java moss.
By the way, having a lot of light and no fertilizers or CO2 will not be good for your plants. If you can find out the wattage this will help us suggest the best plan for your tank.
Go to Exotic Aquarium off of Franklin (just south of the Campbell Soup Plant). They've got great livestock and plants.
There is also a PetLand off off Laguna & 99 that is doing pretty good now. They have one lady traveling around maintaining all of their tanks. The tanks used to be the worst I've ever seen but now are looking pretty good.
If you ask they will order in stuff special for you at both of them.
Anubias and crypts (almost all crypts are low light, but a few need medium light) are really great and hard to kill. Crypts will usually melt at first, but leave them alone, and they will come back from the root.