Arowana tank maintenance tips...

- one of the lowest requirements of care of any tropical species;

- well filtered, soft and slightly acidic water at roughly 28C is preferable;

- in captivity to be kept in a wide variety of conditions ranging from a PH4 to PH8 and KH2 to KH20...depending on specific fish and its tolerance to the environment but...are very hardy;

- (so,) ideal conditions are based around sensitivity to PH and we always recommend owners keep their tanks as close to PH6.4 to PH6.8 as possible;

- exceedingly tolerant of poor conditions, they are not however tolerant at all to changing conditions. The greatest risk your Arowana will face is a change in environment such as changing the filter, or overfeeding a tank that has too weak a filter (which) can cause a spike in ammonia, nitrates or nitrites;

- It is not the conditions themselves that can be harmful but the change which may result in losing your fish;

- A clear example of this is a tank that has been poorly kept for several months. The owner decides to perform a 60% water change with the purest, most perfectly conditioned and correct water. 

- As a result the Arowana becomes unable to swim correctly, starts to rotate in the water and over a week dies. The issue is not the condition of the water but the unexpected change; &

- (so,) this same change could be achieved with 10% water changes per week, or even a reduction of the water level and a drip fed increase over several weeks.

p/s: hope its useful...