Problem with sharks etc

[arni3]

Quite recently one by one my silver sharks have been dieing within short spaces of each other.

The first of all stop eating anything at all and obviously die from it.
some of them were getting fin rot also.

I had 5 of them an they have all now sadly died =[

now i have 2 catfish left and some sort of black/gray asian shark/catfish type fish

The black/grey fish have now stopped eating and it is only the catfish are eating.

one of them is on the verge of dieing and the other one seems ok for the moment.

the tank is reletavly clean and they are always fed enough

what could be wrong?

[Cleopatra the Royal]

The silver sharks are prone to white spot disease (icthyophthirius). This may cause them to stop eating.
Make sure that the water isn't too warm.

Have you introduced any new fish recently - as this may have had an effect?

Photos would really help here.

Harry

[strictly_scales]

Ok, to sort this one out I need proper information. How big is the tank? Whats the filtration. How long has the tank been running? What else is in the tank? What are you feeding? Whats your maintenance regime? Have you added anything new recently?

[geodaryl]

parameters?

[Reptile-newb]

What are the scientific names of those 'silver sharks'?
As silver sharks could mean bala sharks, columbian shark catfish or pangasius shark catfish.