I have a 75 gallon tank. I need to buy more snails and was wondering what are the best for keeping the brown and green algae off my glass. My water parameter are all in near perfect range. Lights.... Actinic from 8am to 8pm and the 10,000k whites are on from 10 am to 6pm and moonlights on from 8pm to 8am. How many snails for this type of algae do I need for my tank?