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I noticed last night that the water was very slightly cloudy but i thought nothing of it. I looked again this morning and the water is very cloudy and there is a sweet smell when i open the tank lid. One of my golden barbs had died overnight.

I have changed 1/3 of the water before going to work but am puzzled as to what may have caused this.

Recent Changes To Tank :

I added some fin-rot treatment a few days ago as the fin on one of my corydoras appears to have a small amount of fungus on it. I removed the carbon filter pad for this treatment. (i replaced it this morning)

I also at the weekend removed 3 plants that were looking a bit tatty and replaced them with different varieties.

I fed my fish a large cooked prawn at the weekend. I noticed a small part of it was still in the tank last night.

Other than the above i am struggling to come up with an explanation.

Any ideas ??

My guess is that the prawn has been poluting the water and caused some bacterial growth in the water, which makes it cloudy. Dead fish is obviously not helping here...

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Mats

thanks. I will remove any leftovers of the prawn tonight and perform another water change. It is strange, i have never seen this before.

I have... And I've seen even worse in my nefue's tank... It wasn't sweet smelling at all, more like rotten sewers... [His grandma was looking after the tank when he went on holidy, using the listed food amounts, but obviously her pinches of food were bigger than the nefues...]

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Mats

When i got home the water had completely cleared. Still a slight sweet smell when i open the lid but almost back to normal.

I know it's a bit late, but I'd do another water change just to be sure...

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Mats