 here are my inputs
Medicines are expensive especially when your pond is big.
I would do the following
1. STOP covering your pond
2. TURN OFF your heater
3. CHANGE about %20 of your water
4. ADD as much aeration as you have
5. NUKE the pond with a 2ppm Potassium Perm. treatment cycle
6. CHANGE another %20 of your water.
7. SALT TO 0.3
8. Inject the infected ones to prevent infection.
9. SIT BACK and WATCH.
My approach might not be a gentle one and might cause a little stress on your fish. But come on, koi are not that fragile.
Don't waste your money on all the mumbo jumbo medicines. Keep your water in top shape and your pond clean + a good QT discipline for new fish. You would have nothing to worry about.
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