Temperature could be a little high, moss prefers a nice flow (to keep them clean), and cool 70s... maybe even lower.
The corys will be happier with lower temps too :3 lol
maybe someone else can come along and help you with lighting and water hardness. I'm quite the noob when it come to that.
My own flame moss loved wood and grew beautifully in a 82F tank, but shaded from direct lighting. I think it did well because it was gradually acclimated to the higher temp...
personally I'm not a fan of meshes ^_^