Should I turn the lights off at night?

[red_roadster]

I'm pretty new to this and was told by the LFS guy to turn my lights off at night or to ut my tank on a timer. This is the same guy who told me I could take a sponge out of the water even after I told him my research had said otherwise, so I'm a bit reluctant to take his advice.
Any input?
Thanx,
Red

 

[terrance]

YEs you should turn your lights off at night, just like us fish need a ight an dark period

 

[red_roadster]

How will it affect algae growth?
Guess this explains why my LM Blennie looks soooo tired! Hasn't slept in three weeks!