I have been looking around this site for awhile and learned a lot. Currently I am making plans for an adult enclosure for my WD. I have most of my plans done, now I am adjusting things for what I need inside the tank. So far the outer dimensions are going to be 6'L x 2.5'W x 7'H. The height the WD will have will be a little smaller because of the lights and the pool. The question I have right now is about the pool, which has worked best for everyone, an aquarium tank or a pool that a drain can be added to? And what have you used as a filter and heater? Thanks in advance for any help.