09-18-2012, 12:43 PM
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First off, Fishwatcher14, welcome to Tropical Fish Keeping forum.
I agree that a 10g tank is much too small for mollies. And at this point, I'll mention our profiles; second tab from the left in the blue bar across the top of the page. Each profile contains info on minimum tank size, minimum number of fish of that species, water parameters, etc. We have some plant profiles too.
Sand works well as a substrate, and some substrate fish do best with it, though here again a 10g is very limiting. Quikrete Play Sand is what I now have in 5 of my 7 tanks.
I would suggest a tank hood/light. The less expensive are the incandescant (screw-in bulbs) and with two Daylight 6500K 10w CFL bulbs you will have very good plant growth.