I use one extra hole as a second emergency even though its somewhat overkill I know two 1-1/2" drains could never plug enough to have a problem. My one inch throttled drain feeds only the fuge side of my sump and my heavily throttled inch and a half drain feeds only the skimmer/mechanical filtration side of my sump. I also have the choice to change configuration for whatever reason down the road or if I wanted to I could increase sump flow or experiment etc... Seeings I had the overflow custom built I figured an extra hole could never be a bad thing. The real key is finding the best height of the pipes in the overflow to keep it dead silent.
Also I don't run a trickle. Just spent a fair bit of time and got it perfectly 'tuned'. I can shut the tank down and start up and within about 5 min its perfectly quiet.
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300 Gal 6x3x28 high Starphire peninsula w/external herbie/bean animal hybrid +150 Gal custom sump with 30gal fuge section, (both built by Concept Aquariums Calgary), 3x Ecotech Radion xr30w g2's(soon to be G3 Pros), Jebao DCT 12000 return pump, 2x Jebao RW 20 powerheads, Tunze Ato, Vertex ro/di, Reef Octopus Ext 200 skimmer run internally.
Last edited by Skimmin; 06-11-2015 at 02:26 AM.
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