Need help with photoperiod

[ag09g]

I have a 28g tank that's still new (set up mid September) and I will be away from the tank for A few weeks. I set up a webcam so that I could check in on it compulsively several times per day, but since its still a new tank I'm currently having little diatom blooms still. I will start seeing it after just a couple days from cleaning the glass, so I'm pretty sure it will completely obscure my webcam while I'm gone defeating the purpose.

My question then is what you think is the minimum amount of time I can keep my lights on while I'm away. The corals I have are a couple euphyllias and zoanthids and the lights are currently on from 11am to 9pm.

Thanks for the input!

 

[Thunder3]

4 hours of blue and white is minimum. Really don't need more than 6 hours of either. Anymore than 6 is for your own enjoyment. Cut down your lighting