Yeah, Melafix isn't all it's cracked up to be.
Hm, it's hard to make it out.
How is the fish eating? I'm tempted to say it's bacterial, but I don't want you to treat unless that's definately what it is. Do you see any little worms, or any other kind of parasite type this around or in the red area?
It's actually a hole, correct? Not just a red spot?
Could you get a pic of your SAE? I'm wondering if one of them tried to snack on the gourami's slime coat. If it's a true SAE, I'd say it's unlikely, but if it's a chinese algae eater, it's possible.