Eric, a couple of thoughts. What are your plans for accessing the front of the tank? Hopefully you'll have doors that are removable since you'll need good front glass access in this monster of a tank. Second, what corals do you plan to keep and what else do you plan for supplemental flow? If you plan on having a lot of SPS and no powerheads, I'm not sure the Dart will provide enough flow through your 4-way. If you will have powerheads, or if the tank won't have a lot of SPS I'm sure the Dart will be more than adequate. Lastly, do you plan on using a chiller? Again, it's looking great so far! Keep the progress coming.