I am currently using 4- 4ft reflective bulbs. 20,000k, 10,000k, 50/50 & an Actinic blue. I haven't changed them in about 9 months so it's time to re up. Which is one reason that I'm trying to sell my rock before buying new bulbs.
I want to sell all the rock at the same time and there is more that 50lbs in there. There are very large chunks on the bottom and it is stacked up with smaller pieces on top. The bottom chunks go from the back of the tank and almost touch the front. There isn't any
base rock up under. I am only estimating but there is more than 100. If you guys look at the pics and feel there is less, let me know.