I bought a massive bottle of the stuff well over 10 years ago. I had no tanks for a few years, and now I have a 55 gallon. I'm still using the same bottle. I have found other, older bottles from as far back as the 80s.
I bought a massive bottle of the stuff well over 10 years ago. I had no tanks for a few years, and now I have a 55 gallon. I'm still using the same bottle. I have found other, older bottles from as far back as the 80s.