Update:
The Apex has been running for about 5 weeks now and I'm really happy with how it's all going.
It's taken a while to get used to the Apex fusion app and I'm still learning as there's definitely a lot to take in, but once you get your head around it and take your time it starts to make sense and becomes easier to use.
In saying that last week I replaced my vectra S2 return pump with the COR-15 return pump and although it seemed easy enough to setup, I still don't even know if I've even set it up correctly lol. The way the pump is setup in the app just confuses me and I'm still trying to understand the schedule, user error no doubt but I'll figure it out eventually. The COR came with a union in the box which I'm guessing is to connect to a flow meter, so I might look at getting one of those down the track.
Also on the weekend my aiptasia eating Copperband died

I'm not sure whether he was bullied as my mimic tang didn't like him from day one, or because they're very passive eaters and he was pretty slack at feeding time as the other fish were always were in turbo mode.
Anyway I'm pretty bummed as he was such a great looking fish and kept my tank aiptasia free.
I've also been running the Red Sea 4 part now for about 4 months and it's keeping my parameters in check.
The medium kit which I got was only supposed to only last 3 months but according to my doser I've got at least a couple more months left as I've been dosing less of it.
As the 4 part goes off one calcium test a week and my calcium is close to where I want it means I'm only dosing 4ml calcium, 8ml alk, 2ml of iodine and potassium and 2ml of iron and bio elements a day. Apparently you're supposed to split the doses to hourly or 2 hourly but if I did that then I'd be dosing 0.1 of Iodine an hour which is pointless. So I've just split them up to dose every 6 hours which means a bigger dose and it's working fine.
Current parameters:
Alk 9.5
Cal 450
Mag 1350
P04 0.08
N03 25
pH 8.2
Temp 24.8