CAE's are bad news when the get older. They get large and aggressive. What type of CO2 are you running? How are you dosing ferts?
Not necessarily true, if you have enough plants, and light, and the proper balance of nutrients, the plants will starve out the algae...
got any Pix?
What are your nutirent levels?
Nitrate
Phosphates
and Iron
err. Sry guys. I only have 65Watts, I forgot to change that number on the other thread..