ok let's get this straight...I've heard so many different answers for this question im just going to ask the experts...whats the smallest tank you can put a silver arrowana in (gallon amount & dimensions)..thanks.
180 is really pushing it, but it can be done because they are so flexible. For the fish to be really comfy get a tank thats atleast 3 feet wide. Dimensions are more important than actual volume, though they do go hand in hand.