yep... as Hobster says: too much work for me
To do it right, that is.
Yes... contamination is an issue. Its the old adage, "you are what you eat"...
and using bulk, low grade lawn fertilizer to grow algae that you will feed your $20K reef tank... is a horrible idea IMO
Dennis is a wealth of information and very objective. He is a savvy businessman and knows that his best consumer is an educated consumer. And educated consumers realize very quickly that growing the best/safest phyto is more than a bottle of greenwater and a light bulb