I have a Current 4X65 power compact light with new bulbs, a coralife skimmer and about 100 lbs of liverock in a 75 gallon tank. My skimmer is in a 20 gallon sump that sits below the tank. I use RO water and dont have any livestock yet as I am still cycling. I do have some macro algae (baseball sized clump of Chaedomorpha and some dragon's breath). Salinity is at about 1.024, Ammonia is 0, Nitrites are 4ppm and Nitrates are around 100. Bear in mind I am still cycling. Temps are consistently around 80 and photoperiod is 12 hours.