Hello! I’m looking to upgrade my light fixture. Actually I have no choice, because my few corals are surviving, and my BTA is dying. I have been looking at Radions, but I’m really confused. First off, the cost of the new ones hurts my head a LOT lol. But, what’s the differences in the different gens? If I were to find a used G4, would I absolutely have to have a Reeflink in order to use my phone to control it? I guess I don’t understand how you control the lights, because I haven’t seen any controls, or actually had a chance to look at the lights themselves.I know the older ones are not Mobius controlled, but what about the gen 4? Is it worth it to get one? TIA