It doesn't make sense to purchase a fish that you don't want in your final set-up just to cycle a tank. Only if you have hyper-sensitive species in mind as final stock. If you want algae eaters or catfish, then get those first. They tend to be quite hardy due to the environment they live in. Pick wisely, though, I wouldn't use a zebra pleco. You can also use livebearers (guppies, swordtails), they can be used as feeders at the end.