Do you already have all the materials for the aquarium incubator? Submersible heater and all? I'll submit that you'll have a much better experience and hatch rate with the hovabator, making it worth every penny of the approximate $40 price tag. If you are just toying around with breeding and sex isn't important (I don't know how accurate those aquarium ones are anyway), you could incubate in a closet in your house. To do this, prepare the eggs like normal, but check for some stable temps in the upper 70s into the 80s in the closets of your house. Sometimes it'll be on the top shelf. I incubated some fattails a few years ago in a closet on top of a water heater and it worked great. Both turned out males, too. (Some people have had difficulty getting males, especially with amels, through temp sexing).
Because there were few Internet resources back then, I incubated my very first eggs in an open-topped rubbermaid shoebox full of moist vermiculite with a desk clamp/lamp overtop w/a 25w red bulb in it. Again, it worked fine, but was difficult to keep the temps steady...good hatch rate, though, and no deformities as I remember.
My point is, they aren't too difficult to incubate, like some reptiles. If they're fertile, they'll usually do well.
I've thought about trying the modified aquarium incubator with one of the huge sterilite tubs to incubate a ton of eggs, but never got around to it and I think my biggest season was around 50 hatchlings, so didn't really need it.
Good luck with whatever method you choose and let us know how it goes.
