Thanks for the help!

Right now we have 3 Kois left, 1 Gold Fish and 1 Pleco, lost another gold fish right after I posted the message, so that's 4 gone.

We have all the water out of the tank, we have the new fish seperated from the old, and are cleaning out the tank.

We are not putting the new fish back in with the old fish.

I'm hoping this will help.