You should also post your location.
Anemones do get big, but more importantly, I doubt the water quality would be stable enough or your light powerful enough to keep an anemone healthy in a 12g nano. Anemones really should have MH light, some can survive under less than MH, but T5s or other lights on that small a tank probably wouldn't be enough for the long term.
(my RBTA can get more than 15" in diameter - no joke)
Anthony
|