IMHO a jar would be able to live a long and "happy" life in a 4x2x2 a sa single fish with appriate filtration.
Remember, most aros don't even get the chance to die from being too cramped. Their deaths are usually caused by jumping, poor water management, power failures, etc.
FWIW
Remember, most aros don't even get the chance to die from being too cramped. Their deaths are usually caused by jumping, poor water management, power failures, etc.
FWIW
...100%. A 180 (6x2x2) would be minimum for a large aduld jar. You figure once you're pushing 30" that two foot tank will make it hard for a big, bulky jar to turn...they are not anywhere near as flexible as a silver.