Yes, I am using a 4 way and an 8 way OM units for two separate closed loops. Each OM will be run by a Sequence Dart pump pushing 3400 to 3600 gph each.
I am using a GenX 35, 990 ghp, currently as my return pump, but plan on stepping up to a GenX40 when I find a good deal on one.
Total volume: 8200 gph or approximately 31X turnover.
I am not using check valves on the closed loop obviously as there is no need. I will not have a check valve on the return either as they cut back on flow too much. I will have an oversized sump, 90 gallons, which will hold the 3 to 5 gallons of water that would spill back down from the main tank during any power outages or pump failure.
I did very much consider using a singe 1000 watt metal halide, but decided against it. I didn't want to do the retro thing any longer as this will be a 'canopy less' design and there are no 'finished' looking pendants for 1000 watt bulbs. Also, I plan on running the halides for only 6 hours each day and needed flourescent supplementation for the early morning and evening lighting. There was no way to install a single 1000 watt halide and the 4 foot flourescents without making a canopy of some kind. Also, the 1000 watter would have to hang pretty high above the tank and that would cause alot of spillover light into my home theatre.
I really like these OceanLight pendants. They give me the best of all worlds.
I should get quite abit done on the tank this week, so I'll have some progress and new pics to share in a few days.
Thanks for all the interest.
).
