Cories clean the bottom of the tank A LOT faster than snails.
I not quite sure what you mean by "cleaning", but cories do not clean the tank in the same way as snails. They do not eat algae or rotten plants. They need to be fed with sinking food like tablets or frozen food:)
But if you ment "cleaning" as in eating the food thats left on the ground, you are absolutely right, and I'm sorry for misreading your post:)
Ah, so no mixing cories. That's alright, I adore the cute little panda cories, so I think I'll go with those if I can find them. Of course, this is all going to be in the works for quite a while yet. I can't even begin cleaning out the tank until this weekend.
I'm curious... how do you go about adding fish for a tank like this? I know you're not supposed to add them all at once... that's too stressful, right? So should I do a few a week, or...?
Keep in mind when you have an established tank with fish in it anything you want to add to it will have to be QT. I would actually suggest getting all of the fish into the tank in one day. and going from there. As for the sorority girls I've always thought to put them all in at the same time, but I've heard adding the least aggressive first.