Umm I think the red/white/blue flashing comment was meant to emphasise the fact that she doesn't care what color the lights are as long as the fish will have a good home to go to once they've out-grown your tank - which they will do eventualy.
The fact that you asked for no comments isn't going to deter me.
Your tank is over-stocked and you do need to do something about it sooner or later. Apparently, you already know this so I suppose telling you goldfish grow to 10" easily and live to be 30 if looked after isn't of any use. They also grow very quickly if in clean water.
You added another fish as well which indicates you don't care that your fish will suffer from the over-stocking even though you obviously are aware that you are over-stocked (or you'd never have said to not comment). Hopefuly you won't be adding to your stock further.
The problem with mixing fancies with the single-tails isn't to do with aggression (though the fancies ar often mroe easily injured). It's to do with competition. Though I personaly do not consider this particular mix to be a big issue, do make sure all your fish are getting their share of food as the fancies are slower and may not be able to get enough to eat. Also, obviously, make sure you aren't over-feeding as that won't help with the over-stocking issue.
You mentioned before that your fish have room to swim but do consider the expanses of water they would have in the wild. Giving them at least the minnimum isn't too much to ask for is it? Plus over-crowding isn't just about physical space. The small volume also limmits the oxygen in the water and means toxins such as the ammonia, nitrIte and nitrAte produced by your fish are more concentrated. Luckily goldfish are hardy so should survive for a good while but, whether you can see it or not, these subtstances cause serious permanent damage if not carefuly controlled. I hope you are doing a large weekly water change with de-chlorinated water to help with this.
Ornaments and plants placed in tanks do displace some water but they also benefit the fish by providing hiding places to reduce stress and, in the case of live plants, will produce oxygen (during the day) and use up lethal ammonia and excess nutrients to help keep water quality good.
Well, there, it's been said. I hope I haven't offended you and I do like the fish. I'm not too keen on the red lights personaly but whatever works for you.
Oh and could you maybe try writing in sentences...?