You're so right Pomtzu. My daughter decided she wanted to try a few fish so she bought a couple of tanks and got some bettas, which are were so beautiful to look at. Red and royal blues...and yes, she did find out they fight and have to be seperated. She had another tank with another kind of fish and a bottom feeder. But no matter how hard she tried to keep the right temps and did everything by the book her bettas didn't live very long. The others did well until they died also. She decided her dogs were enough for her, not having experience with fish it was just not meant to be I guess. We've always admired fish in tanks at doctor's offices, restaurants, etc but never did keep them. But when I see the cost involved and the care required I don't think I could keep them myself. As for KOI, I love to admire them in the many ponds people have but they do need to take precautions even in ponds or they end up a meal for a raccoon or large bird. Koi's just are not meant to be kept in tanks and the cost would be prohibitive.