Kick me when I'm down

[Nemo]

As far as gasses go it is too hard to tell, if the bulb broke before it was submerged then most of the gasses will have gassed off into the room and you will only be dealing with trace amounts. If the bulb broke under water then the gasses will be everywhere the water circulates, and time will release them hopefully. But you have left you anenomea in the tank and if it is doing well then things may not be doing that badly.