Iwould got 2-3. I have 3x13w over my 20gal with no co2 and everything is growing great.
I am talking about the screw in type. I am asking, because i already have a socket that was laying around my house, and was just wondering if i had to go buy another socket.Hi abraham3660,
Are you talking about using the 'screw in' type CFL bulbs or the Power Compact type retrofit kits?