arowana keeps rubbing on side of tank and has created little blister looking things on scale (around the head and top of the head area, well close to the neck section)
Check water perameters, do water change if you have'nt allready. Does salt sound like a good idea guys? I am thinking one tablespoon to every five gallons. Also, what size tank are we talking? How big is your arowana? Can you post some pictures?