When my leaves started looking like that someone here told me to water it with epsom salt. One tablespoon in a gallon of water.

Too much sun I'd say. See those whitish spots? That looks like sun burn to me. Do you have it in all day sun? Has it been there awhile or newly moved to that spot? Even if it has been there since spring, you have to take into acct the sun is alot stronger this time of year. A brug that can take full sun in spring and fall, may not be able to take it in the heat of the summer. I find I have to move most of mine according to the season. Full on summer, they need shade or dappled shade from 12-4.
Another possibility is, did you over fert?
I dont think it needs Epsom Salts tho.
Personally I'd move it into an area with protection from the afternoon sun.
just my opinion....

Looks like some sort of deficiency maybe with some sun damage as well. Epsom salts are a good start but I don't know if it's just magnesium that your plant needs. Maybe some chelated iron? Hopefully someone will have a definitive answer for you.

I agree with Karyn some sort of deficiency. Usually its pale all over if its just espsom salt from what I've seen. Try some of that liquid iron stuff. I use it on my hollies when they get two toned like that and it works great. Some epsom salts wouldn't hurt it but I think its missing something more as well. Try and find a fertilizer with macro and micro nutrients in it as well.