Terramaster appear to promote root growth and algae.  
Comparison are with non-treated on the left and treated on the right.

Picture on the left was taken on April 26 and the one on the right on May 3, 2001.
The picture May 3 compares a two trays that were non-treated on April 26. 
The tray on the right was moved to a treated bed and results are after one week.