Fish dead.

[gregzz4]

Carbon will help if there's something in the water

Lowering your temp from 82 to 75 is a bit drastic

[mark]

know you been up for a bit, any chance mis-dosed the Prime?

[jay2x]

I just checked the PO4 0.25ppm

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[Proteus]

What test kits are you using

[mark]

can't say I've ever come across high PO4 being harmful to fish, just causing algae and stunting corals

[jay2x]

Reef master kit didn't know it was in my stash when I bought the package.

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[GoFish]

What are you testing your salinity with?

[jay2x]

Vertex refractometer

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[The Guy]

What temperature do you run your tank at normally? I agree with Greg a big temp swing can be a bad thing. Constant steady temperature of what ever you choose to run at is the important thing even when doing your water changes. Try and get your new water parameters as close as possible to your system before putting it in. Salinity was on the high side for sure. Good luck, hope this helps.

[jay2x]

Thanks everyone!