Just did the same thing. Crappy lamp time failed on and pumped about 600 ml of All-for -Reef into the tank at about 2ml/minute. Went from 8-ish dKH to 13. I see a some loss of color... not bleaching just turning pale... on a Green Lemonade Acro, and believe it or not, a small Green Slimer. Everything else looks happy. Digi's are loving it! We'll see what happens in the next few weeks.
Unless anyone has a better idea, I'm just gonna double my weekly water changes until it gets back to normal. I've already ordered a Ecotech Dosing Pump to replace my old BRS Pump and Home Depo Lamp timer. I'll be ready when I need to resume dosing.