Thanks everyone for the information! Looks like we have two female Mollies! Thank goodness!

So far, so good. The fish have been doing great! The tank is really clean and the fish are having a ton of fun playing in the water being emptied back into the tank from the filter. The white Molly loves playing with the Bala sharks, while the black Molly is somewhat of a loner. I'm even surprised with the frogs...they are active too!

The cats (well, Noah and Noel) LOVE the fish. The fish were scared at first, but now keep playing while the cats sit mesmerized.

We'll most likely get a cat fish for the bottom if it gets dirty, thanks for clearing that up for me.

I do have a question regarding feeding. I know the Mollies are top feeders, the frogs bottom feeders and the sharks are mid to bottom feeders. We feed flake food for the fish and some pellet type food for the frogs. Is there anything else we can feed them that is better?

Thank you!!!