Sorry to hear this.

We're they both in the same tank? Reason I ask is that to loose one is bad enough, but the coincidence of 2 dying (assuming the second doesn't pull through) would have me asking questions about my setup and food. If they were wild caught you don't know how old they were so old age is an option, it just seems too much of a coincidence for both to deteriorate at the same time without some other factors.

Once again, sorry for your loss.