this is good to hear,moved from NSW to made up salt water and lost 90 percent of my fish to velvet in three days just this past month, have moved back to NSW and things have stabilised again , lost about $4000 in fish, I have a very similar set up to you except I have a air pump running two ceramic air stones 24 /7,I then change out 50 % of my water weekly with Vectra M1 pump , This has stabilised very quickly the tank nitrates run between 3.3ppm and 6ppm in a week 0.06 ppm phosphates doesn't move at all .Won't move from NSW again.My fish and corals get fed all the time.im really happy with the results the tank is stable and thiriving.