well form what I have read and seen in your photos it doesn't looke good! I would NOT go over 1tbsp per gallon on him!! if his stomach is distented you need to do an epsom salt routine!! it works as a laxative but can be stressfull!! Please check aorfanatics.com they have an arowana specific medboard!!! With some asian fish vets that will really help you out!! I would not bombard him with alot of meds though!!! don't do malafix if you can avoid it. Clean water, salt and a little luck is all it should take!!