good thought on the UGF....
I dont know about the aq burning out.. i've had mine for 5+years like that with no probs. But i make sure the water lvl is high enough and the sponge is clean. Just my experience...but i dont doubt it.
See i would rather scrap the UGF myself... and just go with a good filter. You will get that "good" bacteria on and in your gravel eather way over time. You dont need a UGF. They are a huge pain if they get clogged.
But if you will take the time to do syphon your gravel to get the bigger wastes and to flush out that ugf then it should be alright.
But hey... i dunno. I think the fun of trying it all out is neat. I think its the only way to really get a good understanding of how it all works.