Low maintenance aquariums?
First, a little background. I'm a construction worker who works away from home for up to 6 weeks at a time. I also love aquariums. I've had several in the past. A few 30's and one that was about 50. So far, they've all been fresh water and your basic gravel, a few ornaments, and various fish. I've had community tanks and assorted cichlids, so I'm not a total idiot when it comes to maintenance.
I'd like to get a large (to me) tank set up in my new home. It would be about 120 gallons with a 50 or so gallon sump below it where I'd house all the filters, heaters, pumps, and everything else associated. The problem comes in this fall when I'll be leaving for work again. I can have my mom check in on it from time to time, but it would be left mostly unattended. Most fish are out of the question, but what about plants? Can planted tanks handle being left alone for a month at a time once set up? Are there any fish or invertebrates that can live off of the plants while I'm away or would I be stuck with nothing swimming around?
Any help or suggestions to get me back into the hobby would be appreciated.