Sorry it died. Since it recently died I would suggest you do a water change, to prevent parameters, from getting even further out of whack. Test your tank daily for the next week. You also might want to test your LFS
water before you even add it to your tank, to make sure it's where it needs to be.
I would also suggest as others have, to get an RO
water system, and start making your own water, it's cheaper in the long run and, you know EXACTLY what is going into your tank. Keep us posted as to what your results are so some of us can better help you along to get your tank parameters back in line.