Water Chemistry

LOL! I hate that it happened, because it is such a mess, but I am pretty sure that is what happened to my tank last night. I went home yesterday at lunch, and introduced my Berghia nudis to the tank. Since they were new to the surroundings, I turned all the lights off. So, anyway, I get home at like 8 last night, and turn on the lights, and it was a total white out. I freaked, and started to frantically open cabinet doors, turn off pumps, etc. SO, all of the sudden, I see that ...