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?

[scubadawg]

Originally Posted by jay2x

Im not sure if it makes a difference, I just started running carbon...

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There was a bad batch of Carbon

http://www.advancedaquarist.com/blog...or-reef-carbon

[mohammadali]

i dont think the temperature or high salinity killed the fish !
cuz i have had a 29g bio cube too , my salinity been up to 1.030 and ( 84F ) my fish and coral were always fine

when my water temp went high i put Ice in my the back of my tank lol it worked
and check ur PH sometime it could drop fast to low and kill ur fish and coral

and i put fish coral in my 2 days old RSM250 all the fish and coral are fine

if you need help let me know im by surrey central

[Spyd]

Another big one to check is Alkalinity. If there was a larger ALK swing, it can affect everything in the tank as well.

Also, get an RO/DI unit when you can. It will save you many, many, many headaches. .25 for PO4 will cause nothing but problems with coral growth and algae. Best to run GFO in a reactor to help reduce that dramatically.

[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?