I have some but it's REALLY old because I bought it in summer. :/ Do you think it'll work? I wanna start cycling tomorrow so I don't need it immediately as I'm gonna let the fish rot a bit first but if I gotta buy a new bottle I need to know now. XD

For anyone looking to try a fish-in cycle with Tetra Co.'s SafeStart please follow this link to a very important Q&A! http://www.fishlore.com/fishforum/aquarium-nitrogen-cycle/58116-q-tetra-tetra-safestart.html It basically has a guy from Tetra Co. telling you what needs to be done and answers...