Need help, black cloudy stinky water!

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Rawrs.

Candiru
MFK Member
Nov 4, 2009
182
7
48
New York City
Tank has been set up for over 3 months now but two days ago the water started to fog and so I did a 40% water
change next day became even more cloudy decided to do another wc 20% this time. today the water turned blackish and started to stink. Does anyone know what caused this and how to fix it? The fish are fine but are probably a little bit stressed, I also removed the carbon from my Ac110 which I thought was causing the black coloration in water and also removed carbon from my eheim 2217. planning to do another 30% wc today and clean out my eheim filter is this a good idea or no?
 
Clean out any canister filters immediately. I filthy canister is usually the culprit. Just make sure to rinse media in tank water.
 
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