I think that it would be just as easy to divide the pattern "in the round" in half and do it front/back instead of on circulars.
The only thing I'm NOT liking so far on the tank I'm making, is that it has a 4 row garter stitch border around the bottom, and because it's in the round there is a little jog where the garter stitch ends and the stockinette stitch starts. BUT it will be on the bottom of the side and I'm sure no one will notice but me!!
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