OK it was Anthony Calfo that I first heard it from (wheather he originated the idea or not I dont know)
Page 38 in the book: "Book of coral propagation volume 1 version 1.0" shows an image of nutrient scrubbing raceway, and on the following page he explains how to use aiptasia as a natural "scrubber" as they are voracious filter feeders and would be a great method of cleaning for tanks that have high input of foods such as baby brine rotifers and other microfoods. I'll do a direct quote from the book here
 | Quote: |  | | | | | | | | | |
Anthony Calfo: The book of coral propagation, volume one, version 1.0
"Unwanted populations of Aiptasia that grow in display aquaria can be problematic as they compete for food and space and may injure other invertabretes with their stinging tentacles. In a remote downstream vessel, however, they may perform as an efficient living mechanical filter" | |  | |  | |
I have been mulling this idea over for well over a year and am not about to run blind into a method that will plauge my display with a nuiscance.