Sudden Cull Of Fish

[guppyboy24]

ive got a small tank and most of the fish seem to have been killed off is there any chemicals can kill off fish? as tested for everything else and nothings out of the ordinary. The ones left arent theyre usual selves, they seem sluggish and not so vividly coloured, the fish are neon tetras.

 

[The Taffy Apple]

You need to be alot more detailed with your tanks' history to get the answer/s you're looking for...
A FULL set of test results.
How old is it?
Was it cycled?
How many fish do you have?
Have you done anything to it recently?

Terry.

 

[guppyboy24]

had 12 neon tetras, 48 litre tank, cycled, been set up for 6months its weird they suddenly died, nothing out of the ordinary with water tests everything as it should be, um ive not done anything different with them but the light over hangs as it doesnt have a lid, maybe something could of fallen into the tank.

 

[Prime Ordeal]

How did they die? All in one go or one after another over a period of time?

The sluggish behaviour points to nitrite poisoning and probably ammonia too. How are you testing, is it with strips, if so they aren't accurate enough and you need a liquid test kit.

 

[guppyboy24]

how did they die? thats the question i asked originally, they die one after another only 6 left, its odd

and yes i use the liquid test kits.