Angela;
I too enjoy the planted saltwater/seahorse tanks. I could never get my 30 gallon FW planted hex tank looking good but macros I can grow! Just a warning to be sure to be ruthless about the pruning. The peltata I said I had went sexual on my yesterday - I noticed a bit of white on it the day before,and snipped it off but sadly yesterday morning the whole thing was limp and I had to pitch it.
Moral: If it looks odd, remove it before it does go sexual. And make sure you divide everything so if you loose some, perhaps you can save some. My seahorses looked pretty stresses (this was in a 12 gallon growout) but after a waterchange, I think we have things under control. I will do a massive pruning after tax season is over because I know if the caulerpa (razor and feather) ever go sexual, the tank would be toast!