Myself I would leave the tanks indepentant of one another I have 3 tanks all separate and I don't find it's that much work actually I am considering a 4th tank just the power bill sucks with 2 of the three on mh lights. If you are looking for a pump I would recommend little giants caustic pumps I have 2 and a friend of mine has them as well and they are dead silent and zero maitanence unlike the darts. He is building a 375g that the sumps will be in the basement and plans on getting the 3hp mag-drive caustic pump from little giants it puts out 2200gph at 12 feet of head might be worth while looking into one if you decide to plumb them together.
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