What`s up 
I`ve got an expierence with theese guys http://www.djtz.net/home.php?mod=space&uid=413564
https://rover200.org.uk/forums/viewtopic.php?t=11502
http://algaescrubber.net/forums/showthread.php?274-Boundary-Layer&p=40843
 that were mentioned before. 
And I watned to suggest thanks!