To add a bit more information for people who don’t want to watch the videos:
The key to success on the tank was minimalism. Not too much flow, not a lot of light, minimal feeding, low bioload. Red Sea tank was stock, they only added a heater and a light (and later an ATO, although Jake says he’s generally not a fan—he prefers keeping a tank covered).
No refugium, they rarely use chemicals (although since they’re not using RO there are trace minerals in their topoff water), thin sand layer so it doesn’t build up detritus. As Jake put it, “people never come to us because they’ve not done enough, it’s always because they did too much of something that they get into trouble.”
There’s a video on YT where Jake discusses how to optimize flow for corals. He notes that during the day oxygen is waste respiration for corals, and they want to be rid of it. The stronger the light, the more photosynthesis happens and the more oxygen they produce, thus requiring stronger flow to wash it away. If you use dimmer light you need less flow. Temperature also plays a role, but not as much as light.
The coral just need to be able to breathe easily, and they’ll be happy. If the water flow is too weak they’ll suffocate, too strong and they’ll have a hard time staying secure and won’t spread as quickly (but may get denser to slow the flow).