Restless Arowana - Please help

[jijo.raj]

I've 4 year old VFSR arowana, 2 feet in size.

For last 3 weeks my arowana is restless. Most of the time he stand still at one point. Suddenly he swims very fast opening mouth and scratching the body with fins. I tried water change, canister cleanup everything. But still the condition is continuing.

I couldn't find any physical infection or disease. I've dropped bunch of SK gold for him to feed. Some of them died some are still there. Doesn't looks like infected from feeder since the golds were properly quarantined by the fish store keeper.

Somewhere I read it could be due to short circuite of equipments. Hence I disconnected the heater. But no change. The eheim canister filter is still in service. When he dashes i touched the water to check for electric shock which I couldn't find.

What could be wrong? I'm really stressed out everytime i see him dashing that I couldn't help him. please help.