jlk
Aquarium Advice Addict
Oh the poor guy!! Yes, the other 2 will recognize weakness & illness and harass him as well they have had the majority of the tank to themselves so its now 'their' territory. The next time you try this, place the two healthier goldfish in a pasta colander in the tank before removing the divider. Then leave them in there for a couple of hours while your other goldie explores(supervised to make sure no one jumps out). I use a a small plastic mesh laundry-type basket (size of large pot) I got from the dollar store because its deep compared to a pasta colander & I dont have to worry about anyone jumping. Keep giving the bad boys 'timeouts' when ever you see them acting up (a few hrs to a whole day). Hopefully, they will get the big picture sooner rather than later. Hope this helps!