Sorry, your first statment about the mollie not only stumped and confused me, it made me wonder if you live in Alabama. LOL. Never mind.
Agree with Kip, look for the cause of the algea, post test scores, including salinity, temp, and photo period, nitrates, poshphates.. If you know the spectrum of your bulbs this could help as well. As stated if your tank is freshly cycled it could be a normal thing.
If your water is discolored then run fresh carbon.
The snail idea is good, as is the suggestion to read up on sandbeds.
Keep us posted and I will try not to let you spook me again.
Thomas