Some spots or patterns are normal on the head.
But if its new. All you need to do is take out the carbon from your filter and it should go away in couple days
Also ph nitrate is under 40 don't totally remember exact number
Nitrite 0
Amonia 1.00 but tank is still cycling ive been told if amonia is hnder 4 ppm not fully done but I've been that if Amonia goes over 4 do a water change but I do a water change 1 a water week or more then I dose with seachem stabilty
Ammonia at 1 ppm? anything over .25ppm is unhealthy for your fish. Hopefully your arowana can survive this without too much harm done. Not sure where your getting your info from, but you seem to have ignored mine. Very easy to cycle a tank while keeping the ammonia at .25 ppm, unless your just too lazy to do the required water changes.