if the rain dome is on all the time then no you should be fine if it is on every 2 hours u should be fine also but i just use the dripper so if they want a drink when the rain dome isnt on
ya im the same way i have a mist king that goes of every 2hours for about 3mins so i like to know that if he get thirsty he can go to the dripper. One thing i have not seen is him drinking from it but im gone for most of the day so that might be why