You can trim these just like a standard indoor tree. I would go slow with the trimmings though. They don't seem to like lobbing off half the height too well. I trim my few that I have had for awhile about once every quarter. I just go around from mangrove to mangrove to japanese maple to citrus tree and chop off a few branches and leaves to my liking. The more often you do this, the less 'stress' it seems to put the tree through. It also seems the more often I trim, the faster the tree grows. This could be a response to out-compete whatever is 'destroying' the tree, but that's just me talking out my arse.
As for my review of LED bulbs:
After a couple months of use, I feel the $36 18W Ecosmart bulb from HD is a killer growing machine. Has resulted in the best growth from my harvested algaes and mangroves. It has completely destroyed all the calcareous algae, but my lagoon isn't supposed to be purty. It's purpose built. The Ecosmarts also have some rogue star polyps, some encrusting monti and mini carpets growing well with only continued growth. For a 5500K color temp, I'm impressed what $36 can do. The $65/pc custom ordered units may provide a bluer 6500K color temp, but can't hold a candle to the Ecosmarts.
Thought I would just provide an update on my LED adventure.