[naesco]

I take it you did not QT your new fish before it was added to your main tank.
The bucket system is better than nothing or your can choose to treat your fish in the main tank.
Here is what you do
Go to the LFS and buy some Garlic Extreme or go to the store and buy garlic extract.
The watered down garlic juice won't do.
Get some dry food and using a saucer place some dry food and soak it with the garlic extreme. Dry because it absorbs well. Also add some selcon.
You need to feed very often say 6 times for the first week and only garlic soaked food.
The idea is to get as much garlic in the fish as possible. You need to continue to do this for at least 3 weeks. You will notice that the ich will fall off the fish but it will come back if you discontinue.
At the LFS buy a couple of cleaner shrimp or neon gobies (not a cleaner wrasse). Acclimate the shrimp very slowly, please.
You need to start this immediately as your fish have advanced ich.
reconsider getting a Copper Banded as they have a poor survival rate. I would not add anything to your tank for a couple of months and please consider the use of a QT even if it is a bucket.
Good luck