You might want to look into some of the other moss types out there... java moss always became a mess for me. It doesn't seem to want to stick to anything and as a result tends to get stuck in filter intakes. I've used taiwan, xmas and weeping moss to much better effect. If you have trouble finding them you can check out aquabid.

Good luck!

As boarak noted, Java Moss can be a mess in still water. Mainly, it traps debris and must be rinsed regularly. If tied down to driftwood with fishing line, it will eventually achchor on its own.

But its wonderful cover for newborn LB's, that always seem to find the bits of food that get down into it.

Java Moss thrives in moving water, so if you place an airstone under of very near a clump of it, it stays clean and gets quite lush.

I was looking to get some type of moss for my tank too. The only problem is that almost all of the mosses Ive seen have snails. I cant stand snails and dont want them in my tank. Any one know of an online store that sells moss with out snails?

I got some snail-less moss from aquabid, I think from one of the dealers from Singapore or Malayasia. Honestly though, trying to get snail-free plants from anywhere of any kind is a gamble. If you do a search, however, there are many methods of disinfecting plants upon arrival.
Another option, depending on your set-up, would be to include snail eaters. Loaches are famous, but can be big and nasty while the small guys are tough to find and pricey. I've also had, what are called locally "pea" puffers and they don't get much larger than just that, although I still wouldn't trust them with bettas or livebearer young.
Hmm... another thing I should add moss-wise is that they tend to melt as higher temperatures... say upper 70's. Not really discus tank material as a result.

Cheers