the sun rises, stays, and falls for 12 hours in the equator of earth. if you want to replicate the exact amount of light they receive in tropical reefs near the equator 10-11 hours is around the norm. clams do exist in places much further from the equator also, such as the red sea and great barrier reef. they would probably shave of an hour or two of light. in our systems, i would say 10 hours is safe, with 9 hours being no danger as well.
__________________
Jin
Have a nice day!
Current Tank Info: IM40
|