Ok, here it is. I have a 125 gallon rr with two wet dry filters under. I want to remove the wet dry's as they are only allowing for extra water volume right now, I have removed all sponges and filters from them. What i want to do is install two sumps under and plumb them together. The reason for two is that the most water volume i can get in one tank and still slide it in is 25 gallons. I don't feel like this is enough to make it worth my while. If I install two sumps i would put the fuge in one of them but then the other sump will be wasted space with the exception of a skimmer. Have any of you installed a two part sump and if so i would love to see pics. The maximum dimensions i can fit under the stand at one time is 28 long X 12.5 wide X 16 tall. I could probably increase height to 18 or 20.