That sounds like it's going pretty good, Ludwigia glandulosa doesn't like to grow under water anyway and they'll love the moss. I just noticed how old this journal was so there must be a reason you haven't followed up with more photos, is it still growing and producing shrimp.
ludwigia glandulosa grows PHENOMINAL in my 29
here is an old shot
i had some algae and poor color at the time