Circulation is provided primarily by a closed loop consisting of four Sequence 6000seq23 pumps, each delivering 6000gph. The closed loop system is thoroughly integrated into the rock supporting structure. The closed loop pumps are located in the stand just under the display tank. The intakes for each pump enter the display tank from the tank’s bottom and are surrounded by a cage constructed from egg crate to prevent debris and fish from being sucked into the closed loop. The outflows also enter the display tank from the tank’s bottom; but, instead of just venting into the tank, the outflows’ 1 ½” PVC pipes are formed into the shape of a platform which support the rockwork. This platform has 7 water jets coming out at various points. The jets are connected to Loc-line which can be directed anywhere in the tank and are easily re-positioned in the event that a different flow pattern is required. There are four separate PVC platforms (one for each closed loop pump) and 7 water jets per platform, yielding a total of 28 jets with approximately 900gph coming from each. Each platform has at least 3 of its 7 jets blowing under the rock supporting platform to keep this inaccessible area devoid of detritus.
I wanted to create a turbulent, chaotic flow in the tank; yet, avoid complicated wave making equipment which would be visible. The water jets are directed in all directions, including at each other, creating a very chaotic flow without having the complicity that comes with most wave making equipment or alternating flow devices.
The final component of circulation is the flow generated from the two return lines located at each rear corner of the tank. These return lines are powered by two Sequence 4300seq20 pumps that come from the sump .Each of these pumps is estimated to return about 2000gph to the display tank…. bringing the total circulation to approximately 28,000gph.