Whoa, Sally you dug up this thread from 3 years ago! Yes, the issue is retaining too much water with the moss packed in, but as long as you've got some bark and sponge rock in there, that will keep some air in the medium.
When it gets cold enough you'll be growing those babies indoors, which will be much more dry air and you'll also be able to control how much water they get. Just get used to digging yuour finger well into the pot to see if it's dry enough to water.
