What size tank would be best for two LARGE (6" and growing) goldfish?

Because goldfish grow so fast,eat a lot,and produce a lot of waste,you really should try to get at least a 30 gallon tank,but a 50 gallon would be even better.I think well - fed comets can get close to a foot long.Good luck with them!

Well from experience goldfish are very messy and when you try to contain them to a smaller tank, it gets messy quicker and they die in a few days. Realistically you need a large tank with an even larger filtration system for goldfish. Comets (standard goldfish) get very large and need a very large tank (40gallons+). Even as babies they are messy since they produce a lot of ammonia in their waste and having them contained to a small tank will kill them. A 6 gallon tank alone shouldn't even hold a 2 inch goldfish by itself let alone (2) 5 inch goldfish. It's not the size of the fish that is the real issue. Its what comes along with a fish of those sizes. The ammonia would kill those fish in a day or two in a tank of that size. Honestly, goldfish are probably one of the hardest fish to own. They are just very common and people assume they are easy. If you are a beginner fish keeper I don't recommend them. There are a lot of pretty fish that are more colorful and easier to maintain than goldfish. I just don't recommend goldfish in a tank smaller than a 40 gallon because of their waste issues. If you want to keep a tank on the smaller side try looking for smaller bodied fish. But just to warn you, a 6 gallon tank is harder to keep than a 20+. You will have to do a lot of water changes , and frequent water tests. I wish you luck!

6" seems large, but in goldfish terms it's still small. The longest currently living one is 18" long, and bigger has been recorded. A foot long is a size that any common goldfish can grow to in the right environment and with enough time.

So in reality a pond or 100+ gallon is ideal. The realistic answer for you since you want to see them get as big as possible is simply as large as you can afford or have room for.

Keep in mind gold fish have the potential to live 20-40 years (longer has been recorded) and grow all this time, so seeing them reach full size also requires patience and commitment.

The bigger tank you get the bigger they will get. I have two 13 cent comets and a 29 cent gold fish in a 45 gallon tank. The comets I bought for my daughter a year after the goldfish. The Golfish is probobaly 4" I got him at about a inch. and the comets are catching up rapidly. They are about 3.5" and were really small last year when I got them. I feed them pellets and they devour them.

Hi Kris, you have the same type of Goldfish as me & the same attitude toward them. The answer is to get as large a tank as you can possibly afford/fit through your door/stand on your floor-they will make use of every square inch!

You should get ether a 100 gallon tank or build a pond in the back yard with a liner on the wall and a net over and around it so the birds don't get in.

Goldfish often grow to the size of their tank. The general rule is 1 inch of fish per 1 gallon of water, so you'll probably need at least a 20-gallon tank, and a 50-gallon or more if you want the potential of them growing even bigger.

comets get normally around 12" sometimes bigger, so you'll want a tank that is large enough to swim comfortably. I'd go for at least a 50gallon, bigger if you can.

I had 6 big goldfish and i kept them in a ten gallon tank. then they died and i had 1 big glodfish, 2 medium goldfish, and 6 littel glodfish in a ten gallon tank whith alot of decoration so buy a 10 gallon tank

10 gallon tank

10 gallon tank

10 gallon tank

10 gallon tank

10 gallon tank

buy a 10 gallon tank