I am just curious if anyone knows the approximate lifespan of Bucktooth Tetra (Exodon Paradoxus). I have had mine for around 6 or 7 years now. Until recently I hadn't lost any. Over the last couple months I have lost 3 from the school of 12. I must admit I haven't been keeping up with cleaning (mostly vacuuming) but have kept up with water changes. I do not believe it is water quality. I think it is a lifespan issue. Anyone know or have had Bucktooths for quite a long time?

