After seeing your space allotment I had to go measure mine. From the bottom of the tank to the top of the light, mine is 29 inches. My trees are in need of a trim but the most I could cut is about 6 inches and they wouldn't look good if I did that. My light is only about two inch's thick so I'm not wasting any space there. I could have made the root system (aerial roots)a little shorter but thats what makes the trees look nice and realistic. So in a sump where they aren't for show I could have reduced the roots about 4 inch's. My trees are just over 2 yrs old and they are 2 feet tall and have to be trimmed about every 3 months.
Also if they are going straight into the sump you have to be concerned with salinity shock.
Scott
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