My Fish Are Dying

[death]

hi over the last week or so i have lost roughly 5 fish and i cant seem to know whats killing them as there is no visible sign of disease i have tested my paramiteres and all the stats are fine any help is appriciated thanks (ps the wife thinks it is the actuall tank with the tank being rougly 8 year old but i said it is not the tank)

 

[The-Wolf]

sudden unexplained deaths of many fish often points to an internal bacterial infection.
I'd treat with a wide ranging anti-bacterial medication
Interpet anti bacterial is good for this as it is the strongest you can get over the counter

 

[death]

ok thanks wolf ill get some from the lfs and see what happens

 

[TwoTankAmin]

Have you recently added any new fish or live plants or anything else for that matter?