What is a a good sized tank for 4 goldfish?

It's important to realize that the goldfish you buy in your local pet shop are very young and have not reached their full size. ... Common goldfish: 4 feet long and a volume of at least 30 gallons. ... With 7 goldfish in a 40 gallon tank, you have no chance of keeping the water quality as good as it needs to be. read more

Hey New Goldfish Owner! The size of tank depends on the type of goldfish and how many you have, most fair fish are slim-bodied breeds (like the common and comet) and need 40 gallons apiece. The smaller fancies need 10-20 gallons each. As far as proper care goes, I really think the best place to start is to check out our book. read more

A very large one, lol They don’t stop growing and are very messy. Goldfish grow to fit the tank. Those large gold fish you see in ponds start out cute like the ones in the fish store. read more

Goldfish Tank Size Requirements. When it comes to taking proper care of your goldfish, tank size is one case where bigger is always better. A 150 gallon aquarium may seem huge, but keep in mind the smallest natural ponds are many times this size. A slow flowing river may have that much water going past a fish every few seconds. read more