hi kpk, did you have your digi in your tank before you put your new MH's in? sinse i put my MH's in i have a couple of corals bleaching. and i'm only running my new lights an hour a day to start with. they have been hooked up for one week now. so maybe thats what is going on with your digi. but i'm no expert at this, i could be wrong. hopefully someone else might have an idea, good luck, i hope it will be ok.
tonya