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IMO otos could work in a ten, but I don't think you should. The algae in your tank wouldn't be enough to sustain them so you would have to give them vegetables and algae wafers.
Aqua bid is pretty safe. There are some great breeders there that won't give you bad fish. If you don't mind me asking, is your LFS petsmart? Maybe instead of a bottom dweller, you could have a few guppies or something like that.
No mollies in a ten gallon! Have you tested your water yet? How are you so sure you can add fish? Get rid of the cory and molly, we already discussed this.