Overwatering doesn't generally cause yellow tips on the leaves. You can tell an overwatered plant because the leaves droop down like an umbrella. It's possible it's a nute issue, i.e. too much. I know cause I just did this on my grow, and within a couple of days had burnt tips.
Overwatering won't mess up the flowering cycle because that is controlled by the lighting schedule, not how much water you're giving the plant. I mean, you CAN kill a plant by watering it every day, but just make sure the dirt is dry down 2 to 3 inches in the soil, then water.