I would really love to have mangrove trays on a separate rack outside of the tank, is that possible? Like plastic trays mounted on the wall with the light above them, and somehow irrigate the tank water through the substrate in the trays? I couldn't use any fertilizer then, but I could use mineral mud. That way I could have a ton of them, my sump is pretty packed and I don't really want to add another fuge. If I did it this way I could have 100 mangroves growing on the wall, absorbing waste from the tank water, without getting in the way. What do you think?