fool4hws wrote:
> Hello again,
> 
> I really, really need some advice so I am reaching out to the aquarium
> communities for some much needed assistance.  I would appreciate
> anyone out there that can help me.
> 
> As I previously explained, my Dad has cichlids.  He has a 55 gallon
> tank with about 15 small cichlids.
> 
> Today he drained off some of the water and replaced it with fresh
> water.  The fish have begun to die.  We cannot figure out what
> happened.  He lost an entire tank full doing the same thing before. 
> The temperature is correct and the water as far as we can tell is to. 
> He has a great filtering system and heater.
> 
> What could have caused this?  Is there anything we can do to prevent
> more fish from dieing?
> 
> Unfortunately, he is already talking about giving up the entire
> cichlid hobby and I have just becoming interested in them myself.  He
> has endured a substantial financial loss already and this may be
> perhaps the last straw.
> 
> Please help!!!
> 
> Thank you,
> fool4hws

The water you added could have been too cold (temperature stress), too 
full of chlorine, or you may have low oxygen saturation in the tank.

Are the fish "gasping" near the surface?

Greg
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