"Helps" remove phosphate to some extend (if any, it just helps keeping the phosphate low in a already low-phosphate tank). And since you have algae growing, the amount of gfo in chemi pure will do nothing; it might have died as soon as it went into the tank :P I am 100% sure the cloudy water was not caused by carbon; it simply not what carbon does.

It's not supposed to
 

I know it's not supposed to, but even google it man I'm not the only one. When I had my 10g nano I decided to use chemi pure elite and It did the same thing. I decided to give it a second chance and i regret it.

I have ro/di water 0ppm. Should I change 50% or what can I do?

Ok
 

Anyone?

I would probably do a 50% or more water change to help lower the lvl and then run some kind of media to help reduce it further till it gets to a manageable lvl.

That would be a wise idea. Make sure that other than the nutrients, the parameters of the changing water is not very off compared to the tank water.

Tap water. Bad. RO water good. Rinse the chemipure well before using it. These things r designed to help, not cause more problems. There is something else plaguing ur tank. Dead/dying livestock?

Hmmm
 

I've checked the tank up and down and can't see any dead livestock. I can't find the nassasrius snails though, maybe they died in the sand? But again I wouldn't understand how because everything was perfect. I'm going to change 50% of the water and see what happens, if it doesn't help the tank is getting shut right down.

I live in Surrey, near Bear Creek Park.
The TDS today is at 9ppm. I have never seen it above 15.
So I agree with the former poster that mentioned something might be dead.
Whats your feeding schedule?

Maybe?
 

On a side note, Do you have an adequate flow source? Does your tank have dead zones? do you run a sump? anything dead in there? Canister filters are nitrate factories IMO so maybe look into that? Swap out filter socks or filter mediums? too much liverock? Not enough? Skimmer? working properly or don't have one period? Look into UV sterilization?

Just some thoughts into your "fixable" problem.....:biggrin: