Posted: Wed Jul 14, 2010 11:38 pm Re: Pump Size
I would say to go for the 1100 to be safe.you can install an dimmer,that way you could have control over the flow.
I use 2 1400gph pump connected to an homemade filter in my pond,i have great success but the output flow might be strong for an aquarium.
I would say dimm it to 600-700gph for an 100 gallons and distribute it via an splitter or an pipe filled with holes.