our family has just embarked on our first marine reef tank. 75 gallons with around 85 pounds of live rock, 1100 gph pump, protien skimmer, trickle sump, and one power head inside the tank. we have invested what we consider a lot of money into this, so we are very nervous and anxious that it turn out well. oh ya, our nearest retailer for this activity is 600 kms away!!