I work part time graveyard shifts a few nights a week and don't maintain too good a schedule for myself. I just bought a timer for my aquarium lights to help the plants and fish at least maintain a set schedule. I want the lights to be on when I'm awake which is usually during the middle of the night, but I also don't want to miss out on the lighting when I'm in class all day (or have it on when I'm trying to sleep on my nights that I don't work and have class the next day) so I'm debating what schedule to put my fish on. The tank lights honestly don't bother me when I have to sleep during the day, only on the off days when I have to be in bed earlier in the night (for me that's 2am). I've heard that 12 hours on 12 hours off is pretty standard, but that it might increase algae growth so I don't really want to do that. I've also heard of a continuous rotation of 4 hours on 4 off. The 4 on 4 off seems like it would work best for me, but I could also work with the lights being on from 2pm to 2am as well. It's in the middle of my average sleep and awake times and my tank gets a little indirect lighting from the window in the room. Does anyone have any experience keeping plants and bettas happy on a 4 on 4 off schedule?