Ooooh no no no! AQ salt is definitely not for bloat lol. Okay here's the difference:
AQ salt balances out electrolytes and invigorates the slime coat which makes them overproduce their coat and eventually shed it which is good for external parasites like Ich and sometimes early Velvet. However, AQ salt like most salts actually makes the fish retain fluids including water, which can make a fish become bloated if used too long or too much/too often. AQ salt can be rather harsh on their systems as well if they're already compromised and this makes their liver's/kidney's work ten times more which can sometimes lead to organ failure.
Epsom salt is a natural laxative and is often used on horses and our feet to soothe swelling and heat. In fish it's good for flushing out their system if they have internal parasites or constipation, both which can lead to a bloated fish.
So in a general way of saying; AQ salt for external stuff and ES for internal stuff.
