In drier to moderately dry climates, using a screened top and having heavy aeration and a fan blowing across the tops of the aquariums can also lower the temperature some. Ken Join the AKA at http://www.aka.org/aka/modules/content/index.php?id=9. Archives are at http://fins.actwin.com/killietalk/ Modify your subscription at http://www.actwin.com/mailman/listinfo.cgi/killietalk