amrita

I have bought a fish tank on 11th Nov...bought 12 fish... one by one they all started to die we cannot understand how this is happening Need help...coz this is my first time

Allie

What size is your tank? Sometimes adding 12 fish at once can cause a huge ammonia spike and a change in your tank's water chemistry.
Did you cycle the tank first?

sgould

Is the tank cycled? A new tank with large numbers of fish introduced simultaneously could easily generate enough ammonia to poison the fish, as Allie mentioned.

http://www.fishlore.com/NitrogenCycle.htm

J J Indy

If you bought the tank on Nov. 11 I really doubt it could be cycled as sgould has put a link about the cycle in his post I would seriosly read it and where ever you bought the tank should have told you about the cycle and that it would take a few weeks to a month to cycle.

amrita

Thanks so much for the reply..I shall look at this issue...of the tank

shellman 2

it could be that there is not enough bacteria in the tank for the fish to survive.