I'll do my best. I do not know their exact methods, but most that I have discussed are general.
The system is around 3500 gallons. There are 2 turf scrubbers on the tank that are always running. The protein skimmer has not always been on there and is not always running due to dismantle and cleaning times. The holding tank for their water changes (once a month) is about 500 gallons. Besides feeding the fish they feed phyto plankton. That's about it other than being consistent with the schedule. This part I think is key to the success they have, so no pushing water changes off or less. Also with using just natural seawater every element is in check from the start. Other than having to aerate it from a negative ORP (comes from a saltwater well). The tank has had corals spawn at the same time as the wild since 2006 with the Acropora cervicornis spawning this year. They have also had some fish spawn as well, but I do not know for how long.