here is the post where i started talking about the ats i had on the 240

http://www.maast.org/showthread.php?...455#post672455

i was already skimmerless on that tank, but i saw a huge reduction in algae growing in the tank and on the glass once the ats was really settled in. i only stopped using it bc i sold the tank - i think don (the tank buyer) was continuing to use it. i considered adding one to my current tank, but decided the bioload would stay so much lower that i wouldnt need it.