Can I mix goldfish and koi in an aquarium?

[Irie G]

Hello guys,am new into this and very willing to learn.I have a 120 litres aquarium with 8 small common goldfish.I was thinking of introducing 4 3" koi fish.any advice

 

[Jhn]

Your tank already has too many fish in it. I would pick fish that stay a smaller size than goldfish for that size tank.

 

[Gemma]

Hello and welcome, Irie
Beautiful tank you have there!...but unfortunately I have to agree with @Jhn on this one

 

[Angel]

red label yum... and welcome

 

[addy1]

Don't add koi, they will out grow that tank quickly. Agree with all above. Very pretty tank btw.

Welcome to our group!

 

[Lisak1]

Welcome! Love your tank! But those 3" koi will soon become 12" koi, and then 24" koi and possibly even 30" koi.

 

[mgmine]

Yes you can mix them but as others have said you shouldn't have too many fish. On the other hand you can always give the fish away if you find it isn't working out. Koi grow quickly in ponds but I don't know how fast they will grow in a small aquarium.

 

[Tula]

Welcome

 

[Irie G]

Your tank already has too many fish in it. I would pick fish that stay a smaller size than goldfish for that size tank.

I did not understand your statement,please elaborate

 

[Irie G]

Hello and welcome, Irie
Beautiful tank you have there!...but unfortunately I have to agree with @Jhn on this one[/Q
Thanks buddy

 

[Irie G]

Thanks a lot for the welcome,I usually enjoy my whiskey when feeding my new found friends (fish)

 

[Irie G]

Don't add koi, they will out grow that tank quickly. Agree with all above. Very pretty tank btw.

Welcome to our group!

Thanks alot

 

[Lisak1]

I did not understand your statement,please elaborate

Even goldfish can grow to six or 8 inches. That appears to be a 30 gallon tank (US measurements). Those fish are going to outgrow that tank very quickly. I am not an aquarium fish person, but you want fish that will stay small for a tank that size.

And all due respect @mgmine - but I would never recommend that someone buy fish with the intention of giving them away when they get too big - especially when it's a guarantee that they WILL get too big. That would be like saying go ahead and get a St. Bernard puppy for your small apartment - when it gets too big, just give it away. Why start out wrong?

 

[Irie G]

Thanks alot

But maybe I could ask just to have more knowledge.am planing to have a bigger tank in an years time.for arguments sake if I add 4 3" koi how long would they stay before they demand for space?

 

[Lisak1]

if I add 4 3" koi how long would they stay before they demand for space?

One minute. They will start growing the instant you put them in the tank. The bigger point is you already have too many fish for the volume of water. Adding four more may just tip you over the edge and you won't have to worry about a bigger tank.