Cold Water Fish Help Please

[lucejayne123]

please help me, my coldwater aquarium has been running for a year and has shabumbin goldfish commets and fantail fancies in we noticed 2 days ago they had finn rot so we have treated this with some anti fungus. 3 of my oldest and biggest fish are resting on the bottom of the tank very still and this is unusual for them.and the rest of the fish seem very still
im worried there dying i folllowed the instuctions to a tea

my tank is a rio 240

any help welcomed

 

[saltynay]

Water stats (ammonia, nitrate, ect)?
Any new additions to the tank recently?
Description of visible sores?
Unusual behaviour?

Atm I would say a 30% water change with the addition of aquarium salt as a first step, then introduce some live food such as brine shrimp to see if they are active. Whatever you do don't touch the fish e.g. poke them to see if they are alive until you are sure that they are dead as this may remove some of there protective slime coating making them susceptible to more problems.