Generally when it comes to fancy goldfish (the twin-tailed varieties, for the most part,) for stock levels most people will recommend 20 gallons for the first fish and 10 gallons for each subsequent fish… minimum. For single tailed varieties, you’re looking at double that, since they tend to get larger.The problem with fish bowls (and even like, ten or twenty gallon tanks,) is that goldfish are *very* dirty fish, and they grow quickly. So they’ll tend to outgrow a ten gallon tank extremely fast. That size will do for quarantine but not in the long run. Just for example… my Ryukin goldfish weighed in at 10grams when I purchased him in January. I weighed him a couple days ago, and he’s up to 119 grams. He weighs over a quarter of a pound now, and that’s like… six months growth. Goldfish can live for *years* if you give them space and good living conditions as well, and they really don’t stop growing - growing to the size of the tank is a myth.Another thing to consider is that the larger your tank, the easier it is to maintain a nitrogen cycle and the less chance you have of toxins building up to quickly. I’ve got two tanks right now, a 60-gallon with four goldfish in it (and I probably won’t increase that stock level because of how large my Ryukin is probably going to get), and a ten gallon with a male betta, a couple corydoras catfish, and a snail. The ten gallon gives me WAYYY more issues when it comes to stuff like algae and just water levels in general.Bowls in general are just… inappropriate. They, unfortunately, don’t have the water volume you need for a goldfish, and its very hard to filter them. Which I mean, you obviously cared for your fish because you were careful to keep up with water changes and whatnot, but in the long run a nice sized tank would be much better.If you can get a thirty gallon tank (and you’ll want a filter that moves at least 300 gallons/hr), you could probably do two fish of a variety that doesn’t get huge (so avoid Ryukin, they’re the chunky meat-monsters of the fancy goldfish world) and they’d be happy.I dunno… I’m kind of rambling. goodness x.xEDIT: Basically some of that was *probably* confusing, so yeah, just poke me and I’ll help out however. I just got off a ten hour shift so I’m probably making little sense ;pEDIT EDIT: If the new tank is less than twenty gallons, you may consider fish besides goldies btw - I know you have your heart set on goldfish but they really do do better in larger tanks. They're basically domestic carp, and it shows in their waste levels and growth.