I am interested in using mangrove plants for filtration of my 180 gallon marine tank. I was wondering if the plants can be completely submerged in the tank? Everything I have read on the internet appears to have them in an open tank, or the sump with the tops above the water level and requiring a seperate lighting system. I cannot place them in my sump, due to the fact it is completely enclosed in the cabinet, and adding a light in the cabinet will cause over heating of my tank. If anyone uses mangrove for filtration, I would appreciate your assistance with this question. Thank You