1) Must know how to choose good healthy goldfish from the shop if not later will face with sick goldfish.

2) The tank must be properly set up before buying a goldfish, one week or two week earlier.

3) Cycling the tank the Most Important thing, if not proper cycling you will face with high ammonia and nitrate level this will kill your goldfish.

4) Each goldfish need 20 gallons of water, so must use big tank.

5) Good fish food that will not cloud the water.

6) Goldfish tank need a powerful filter to clean the water.

7) Weekly maintenance 25% water change.

Haha, to choose a good healthy goldfish need experience, by looking at the body look for injury,any spot,any sticking thing on the body. Mostly healthy goldfish will swim around happily.

Goldfish can live longer than that if proper enviroment is achieve, there is a lot of sign shown by goldfish floating like not enough O2, dirty water etc.

if u have also read the Aro's thread ......u should have read what i wrote before
those fish can only bring good fortune for the one who selling them
cause they usually sell the fish quite expensive especially Arowana

don't u agree??

hhahahhahah nice one!

anyways zeist, i salute you for wanting to know more about potential pets b4 buying them... but in this case google will be a better and faster option