Setup for a new highback golden arowana

I got my asian arowana on April 26, 2021. It is a highback golden arowana from an Indonesian farm. When I went to the pet store to buy the arowana, I had the options of highback, 24K crossback, and golden helmet. I noticed that the super highback was the most responsive to humans, i.e., the presence of us near its tank, whereas the others did not much respond to us. Based on that, I decided to go for it, and bought the super highback. The arowana came with a chip in it and a certificate from the Indonesian farm where it was bred. The arowana was quite relaxed and did not jump on the hour-long journey to its new home. 
I put the arowana in my present tank having dimensions 3 ft X 1.5 ft X 1.5 ft which translates to 62 gallons (235 litres) water capacity. While this tank is not adequate for a full grown arowana, I only intend to use it as a temporary tank for and will soon upgrade to a bigger 8ft or 6ft tank in few months. For the present 3 ft tank, I am using Sun Sun 304B cannister filter. The flow rate of the filter is 525 GPH/hour and is designed to handle fish tanks of 150-200 gallon capacity. I also have oxygen pump and LED lights. 

Initially, I had few decorations and river rocks (pebbles) in the tank along with a dozen tiger barbs. Within first nine/ten hours, the arowana had eaten two of the tiger barbs and so I decided to put the remaining tiger barbs in another tank. Since the arowana was very active and swam through all volume of the tank, I also removed the decorations and the river rocks. Then I bought two pieces of glasses as lids for the tank. I made the tank bare bottom and put vinyl on both side ends of the tank. I did not, however, put vinyl on the back end of the tank as the arowana apparently enjoys watching out of the window behind the tank.

Since, this is my first time of keeping an arowana as a pet, I am still researching on the care to be taken and the requirements for keeping the arowana healthy. Any suggestions to help me keep the arowana, are welcome :D

My new highback golden arowana


My new highback golden arowana








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I am Nikhil Tanawade, a much-stereotypical Indian who is an engineer (from VNIT, Nagpur), an MBA (from JBIMS, Mumbai), and now working for a bank (all are the same). I am enthusiastic about music, passionate about technology (also start-ups), follower of intellectual property trends, and reader of various blogs/trendy feeds.
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What happened to my arowana ?

As I had written in my previous post, my arowana ate two tiger barbs within a few hours of putting it into the tank. Two days later, I noticed my arowana exhibiting strange behavior. It started sitting often on the tank bottom for a long time. It started swimming slowly and with clamped fins and tail. Sometimes it even spooked itself like there was an invisible wall in the tank. I thought of various reasons why this behavior would have happened.  1) Stress due to incorrect water parameters: I checked all the water parameters using the API master water testing kit and even did multiple water changes. All the water parameters were in the normal range and there was nothing wrong about any parameter. I put Indian dried almond leaves to neutralize the pH of the water. I also put API stress coat to  condition the water.  2) Lighting: Since my tank is near a huge window, I tried various lighting conditions to check if the arowana's behavior persisted. I tried darkening the roo...
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