I personally wouldn't frag it atm as its a little samll and you could kill it, especially since you only have one. Place it in a moderate flow with medium lighting and it should grow well on its own and start to divide itself. Temperature is a big factor in coral propegation as it speeds up the metabolism of the coral but it is not recommended that you increase the tank temperature just to get your coral to grow a bit more as this can cause problems elsewhere in the tanks ecosystem.