12-25-2011, 07:40 AM
Join Date: Jul 2010
Location: Dallas, Texas
| | Re: New 75 gallon low-tech tank
For low to medium light, a 10 or 12 hour photoperiod is OK. A high light tank might have a photoperiod as short as 6 or 7 hours.
From your equipment, my guess is that you have low to medium low light. But you really need to borrow the club PAR meter--it's the only way to know for sure.