Minimum tank size for sliver or black aro

[rumblesushi]

I'd say more like 25 inches.

 

[rumblesushi]

I currently keep a 12 inch aro in an 18 inch wide tank before he goes into my 30 inch wide tank. When I look at this growout tank lengthways, he only needs about 6 inches to turn.

 

[hewhorunswithscissors]

for most of us (self included) there is a difference between what size tank we SHOULD have for our fish and what size tank we can keep them alive in.

You can surely keep a full grown arro in a 30" wide tank. They WILL be able to turnaround for sure. Does not mean you SHOULD do it. "CAN" and "SHOULD" are not the same thing.

I feel like a tank should be minimum length 3x the fish and width 1-2x the fish. (I do not follow that rule myself... just saying I think its best)

My 20"+ arrow will (when chasing other fish, a little excited or eating) will swim the tank VERY quickly andeasily use all the room in a 8x4 x 3ft tall tank... including the height.... you give them the room, they will be better off. You don't give them the room, you will probably still be able to keep them alive and healthy but I think you are missing out on some of the enjoyment of seeing how a fish moves and behaves in more open water

 

[kriztu]

That didn't quite answer my question. I was referring to moving the fish from tank to tank as it grows. For example, starting out a 2" one in a 10 or 20 gal. Then when it hits 5-6", move it to a 55 or 100. That kind of thing.
I guess the main question is at what point does, for example, a 150 gal become too small for a growing arowana?

you better start with a 50g, less work in water changes for a growing up tank. silvers excrete a lot of waste, starting on a 10g just doesnt make sense

 

[Steve_89]

you better start with a 50g, less work in water changes for a growing up tank. silvers excrete a lot of waste, starting on a 10g just doesnt make sense

I agree.

I like to start all my juvie off in smaller tanks and upgrade as I go. I do already have these tanks though.

This can be expensive if you don't already have the tanks.

 

[T1KARMANN]

its not really less work starting off with a smaller tank as less water can lead to more problems

bad water will affect a fish much faster than it will in a larger amount of water