an additional thought.. they don't have to be the same volume, so long as the surface of the water is at the same height, as I understand it. I have a 20 and a 29 next to each other, and I might do a manifold setup with a larger canister instead of a single canister for each, and when putting them up, I made sure the water level was going to be able to equalize between the two at an acceptable place on both tanks. Anyway, the 20 sits a *tad* higher than the 29, but the canopy would hide the fact that the 20 wasn't totally full if I needed to drop the water level to the same height as the 29. Make sense? You should also *try* to make lengths and elevations of tubing on the input and output side equal from each tank if you really want to have 1/2 the power of the filter for each tank. If one tank is running through 6 ft of tubing, and the other only 3, the one with the shorter tubing will get much more circulation than the one with 6. (just think about single tank setups... 3ft. of head is much more efficient than 6... now you're splitting the output and inflow... the side that needs more work will get less flow than the side that needs less work to get the water to and from the filter).
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