Sorry to disappoint some here but Milton is 110% perfectly fine this morning after a 1/2 teaspoon of melafix.
He doesn't seem to be affected in the slightest, no rapid gill movements, no erratic swimming, no gasping at the surface. He ate his breakfast like a champ
Today will actually be his last day with melafix since I only started using this to try to give his fins a healing boost. It will take a good long time for them to fully heal and melafix isn't really needed unless he develops fin rot or other conditions, I he did have rot or other issues I'm confident that its gone now :)
Since I have used this for 5 days, Milton isn't dead or damaged from the medications so I am going with 'its safe if used controlled and monitored environment' I didn't go adding random amount and guesses, I actually used baking measuring spoons so it was accurate, if I were to use random metal teaspoons or guesses by other means then it would be a different story and maybe this product would be dangerous.
I would also only use this as a last resort kind of situation. After doing salts / stress coat etc and not seeing a change, I stepped it up to melafix since I struggle to find medications in my area (and not having an endless supply of money to order from overseas)
So in the end Milton was perfectly fine, melafix didn't kill him or even damage him however I would reccomend using caution if for any reason anyone else has to use it.