I'm not so sure about the holding tank theory... he appears to keep his tanks pretty well stocked.
http://www.anythingfish.com/images/Ted/PhotoGallery/RedTail2.htm
But he's got the dedication, skill and filtration to manage it.
Wish I could figure out a way to keep my tanks that stocked. 
But he's got the dedication, skill and filtration to manage it.

