I couldn't help but notice you are planning to put a molly in a 10 gallon permanently. They realy do need at least a 15 gallon. I would say more. Mollies CAN get to 6". They very often get to 4". It is a misconception that they stay small and are good fish for a small tank. If you want to save the molly, great, do that. BUT, then, especialy if you want this to be a community tank, just stick to the one and put in a couple of otos or something as tankmates. A 10 gallon is realy a very small volume. If youw ant more than one molly, stick to just the 2 mollies (of the same sex). Don't add anything else. Putting in bottom dwellers will realy over-stock the tank. Remmber, most of the common cory varieties get to between 2" and 3" and should be in groups of at least 4 so they are not a good option for a small tank where the footprint of the tank is small. Also, most plecs get to big for a 10 - even a bristlenose would be crowded with a molly in that size tank. Obviously, I don't know what you have actualy decided but I thought it was worth mentioning anyway - just to avoid problems for you and your fish.