Closed Loop Circulation

[uncle fester]

Researching this as an option to increase water flow in 92 gallon tank. Searched the archives but was unable to find any info. Concerns and warnings I should be aware of? My tank is a 92 gal RR corner. Current circulation provided by an Iwaki WMD 30 routed through two Ocean Currents Oscillators. Water leaves tank via 1 inch pipe/bulkhead/overflow. Returns to tank via 3/4" bulkhead/pipe. I'm looking at changing circulation in the following ways. 1) Both pre-drilled holes 3/4" and 1" will become drains. 1" drain will go to sump and water will be returned by WMD 30 through one oscillator. 2)3/4" "drain" will be intake on closed loop for recirculation via a second WMD 30 through at least one more, possibly two more oscillators. Any help out there? Thanks

 

[hondo]

hey uncle fester, I noticed in another post you said you had a frilly white nudibranch. I think I have the same thing but have been unable to positively ID it. Mine has a solid white body 1" long with lace like frilly things on each side which are also white. Is this what you have and if so what is it and will it eat any corals?
Thanks for any help you can give me.

 

[uncle fester]

Hondo, haven't noticed any probs yet with predation by nudibranch. But I am always watching for it!
I forget who mentioned problems with the Ocean Currents oscillator. One is brand new. The other was in operation on my 30 gal for 8 months before switching over to 92 gal tank. Every now and then it would stop, but I feed by dropping flake food in sump at intake, so debris blocage was most likely at fault. A light tap has always restarted it.
The U-tube spoken of, would that have to be primed initially? More than likely, it seems, after a power outage sufficient water would remain present on intake side to restart siphon. Is this correct?
Doubling return water volume through sump is NOT an option for reasons cited earlier, noise, bubbles etc.
Latest (changed today) configuration has only the single WMD 30 RLXT (I think, definitely the higher flow version) providing recirculation via one oscillator. Found that by splitting return from this single pump, water exchange rate suffered. I now get much better "flow" rate through the single oscillator than with two.
Thanks for all the input!

 

[uncle fester]

Golfish, I was speaking specifically at initial (first) startup. Did you just fill the intake line with water and let it go from there?