Quote Originally Posted by dead_sled
Just to preface this post, I am a newb. I am under the impression that phosphorus is usually at sufficient levels in ap systems. I read that fish waste breaks down to the NPK ratio of 20:20:1. Seems like sufficient phos. http://www.aps.uoguelph.ca/~aquacent...t%20Manure.PDF

Basil1, do you have worms in the grow beds to speed up the break down off solid waste? Have you tested the phosphorus levels? Could be a ph level problem, also

You need to repost your hyperlink above...it goes nowhere JCO
New link: http://www.aps.uoguelph.ca/aquacentr...0(Jun2007).pdf