I need to get some flow advice from you guys. I have two options, tell me which one you like better.
Option 1:
225 6' x 2' SPS reef, all the following items have been purchased..
a. Barracuda return pump on OM 4-way with 4 nozzles on the top of the tank pointing down at the rock from the front.
b. Dart pump on closed loop with two 3/4" sea swirls mounted on the back corners and two 1/2" fixed nozzles on either side of the overflow pushing water behind the rock. I would need to cut two 1 1/2" holes in the back about a third of the way down on either side of the overflow. One benefit of this is that I was going to hook up a ball valve to the closed loop intake which would allow me to drain the top third of the tank by simply running the hose to a drain and turning the valve. Downside though is that some random person might get curious and decide to see what happens when they turn the valve, thereby draining the top third of my tank on to the floor.
c. One Vortech powerhead hidden somewhere in the back between the rock.
Average watt consumption with this setup = 408
180 Fish Only..
Dart return pump, no wave device, just two, maybe three fixed outlets. This will be fish only for a long time. In a few years when the 225 has filled out I may upgrade the lights and turn it into a softy reef.
Option 2:
225 SPS reef..
a. Barracuda return pump on OM 4-way with 4 nozzles on the top of the tank pointing down at the rock from the front.
b. Sell the closed loop dart (brand new in box) and buy an additional vortech powerhead. So no holes drilled, just two vortech pumps pushing about 6,000 gallons per hour, hidden somewhere on the back, between the rock. I'd loose the nozzles pushing water behind the rock but I'm guessing the massive amount of flow the vortechs create and the undertow effect would handle any dead spots behind the rock.
Average watt consumption with this setup: 298
180 Fish Only..
Dart return pump with two 3/4" sea swirls. This may elimintate the need for powerheads in this tank. At least as long as it's fish only.
Here's what I like about option 1: It won't cost me anything extra, I already have everything. I also like how random and chaotic the flow will be coming from so many nozzles, two of which are oscillating. What I don't like is the holes in my tank, an extra 110 watts of energy consumption, more plumbing and chances for leaks, maintenence on the dart which will be difficult to get to behind the tank, and frequent cleaning of the intake screens. Not sure but I also think there's less "total GPH" with this setup.
What I like about option 2: None of the downsides of the closed loop, less energy consumption, I can place the powerheads anywhere I want making it very adaptable, lots and lots of gentle flow. I also like that with this setup I won't have to run the barracuda return through the overflow, thereby eliminating two 90 degree elbows. I also think the 180 will benfit from having the sea swirls. I should be able to avoid having to purchase powerheads meaning less energy consumption and more money in my pocket. I don't like the fact that I'll need to sell a dart and spend a little extra for another vortech but that's not really a big deal.
I think simply writing this down has helped me make up my mind but I'd still like to hear what you think.