I've been maintaining fish tanks for over 25 years. Started off with an assortment of tropical but for some reason goldfish are my favorite. Something about their personality and oh, they are way easier to care for! I never tried salt water, seemed way too much work. I had an uncle who had some thou. He would explain how much work it is to maintain, kinda like how Nick laid it out.

Like I said, I've been just into goldfish for a while now. I raised one to almost 14 years then started another who recently passed at 12 years. I "trained" (if you can call it that) the first one to come up to eat out of my hand when I tapped the glass in a certain spot. The last one seemed much less interested, thou like all goldfish he sure loved to eat.