Something is majorly wrong with all my tiger barbs! Help!

[kades]

They are dropping like flies and look horrible they all were fine 2 days ago. Their fins look weird and they appear to be shaking then they will float around for a min I'll think their dead then they'll start swimming. I've lost 3 in 3 days.



They pics do nothing for it but ANY input would help. I checked the water last night and the nitrites are dropping finally they are 1 and the nitrates are going up a little but not in danger zone yet.

Oddly enough my other fish (my blood parrot) who I didn't think was going to make it seems to be doing great now so this is why its weird to me.

 

[LyndaB]

What are your parameters.

 

[kades]

Ammonia 0
Nitrites 1
Nitrates 20 (or around)
Ph 8.1 (normal)

I've been cycling since december 15th and I think I just got over the nitrite phase I've been doing water changes every day (50%) the nitrites are doing fine as of yesterday.

 

[LyndaB]

Some fish don't do well when they are used to cycle a tank. It is, after all, a toxic environment.

Do water changes to get that nitrite reading to 0.