Dear friend-- it seems obvious to me from the capital letters that you intend to keep the goldfish, so the best we can do is try to help you with your current situation. Although it would not be my first choice, I hardly think that keeping one comet in a 40 is tantamount to fish murder. As Inka pointed out, goldfish are social fish, and prefer the company of others. I would suggest cycling the forty, doing daily water changes on the 1 gallon (yikes!) providing excellent filtration and moving on from there.
I agree with all the previous posters that really, goldfish cannot successfully be kept with other species due to temperature differences. Most goldfish enthusiasts also believe that it is inadvisable to keep comets with fancies due to differences in feeding speeds-- but many people do it anyway.
Your best bet is to read up on as many goldfish sources as possible and get as much information as you can before proceeding beyond cycling the 40. A comet will stunt rather quickly in a 10 gallon. Please also know that feeder fish often carry disease, so be on the look out for flukes and other nasties that may occur in the fish and require treatment.
I wish you good luck with your fish, and if you are ready to hear any more sound advice from experienced goldfish keepers, perhaps someone here will have beneficial advice to offer.
I agree with all the previous posters that really, goldfish cannot successfully be kept with other species due to temperature differences. Most goldfish enthusiasts also believe that it is inadvisable to keep comets with fancies due to differences in feeding speeds-- but many people do it anyway.
Your best bet is to read up on as many goldfish sources as possible and get as much information as you can before proceeding beyond cycling the 40. A comet will stunt rather quickly in a 10 gallon. Please also know that feeder fish often carry disease, so be on the look out for flukes and other nasties that may occur in the fish and require treatment.
I wish you good luck with your fish, and if you are ready to hear any more sound advice from experienced goldfish keepers, perhaps someone here will have beneficial advice to offer.