Chubby;
Leaving aside the important issue of tank temperature for a second....
The goldfish cannot live happily in that size a tank,as you say you have done your research so maybe you simply missed this point?
The accumulation of waste won't be good for your fish, and not to be nasty

but alot of fish die while in good colouration, you can't really base a fishes health on its colour, although in some cases it can be a good indicator that there is a health problem this doesn't necessarily always apply.
I'm not even insinuating that your fish are ill now, but in the long run taking into consideration the main two points raised (temp and size) your fish may eventually suffer for it. If not directly killed by it, both issues could reduce your fishes lifespan.
If some posters sound to you a little snappy, don't worry, they care about their fish, as you obviously do by posting and trying to learn via this site.
You should listen to what they all have to say, they are only trying to help you.
