If your tank still looks like it does in the clear pic, I personaly wouldn't go as far as 100%. I do 50% every 2-3 days (yes, I'm overstocked). I do so to keep nitrates down, as well as aid in growth. My lights tend to be on for a good 14-15 hours (just because I never remember to get a timer when I'm out, maybe this will remind me), and I have no issues. Just keep up on your changes.
wouldnt it just go through a quick cycle with the established filter in. and the algae bloom will be prevented from shorter light durations.