1 year in. Help me fix my water chemistry.

[attiland]

I know both phos and nitrate are too high, I know I feed to much atm and will be reducing that, also that I have just 2 weeks back dosed reef flux which killed all the bryopsis that was locking up these two and that I'd see them climb. So I am contemplating and will likely end up water changing today by 25% and I'm working towards a display refugium to combat it long term.

What do you mean by 'any mg is too high'? Magnesium is a fundamental building block element for coral and people dose it. Do you think it's harmful? This poll I found seems to indicate people are experiencing it, albeit at lower levels than mine, but still at levels over 1350.

Any in that sentence means and just didn’t realise the autocorrect. Sorry about that.
Mg at 1500 is high. You should be at 1350 level.
others said already but here it come again. Dose with a doser or by hand not by ATO. You will be in trouble if you do that.