Found some post on R2R and there was an interesting paper on Nitrogen/Phosphorous limited growth. This one didnt test chaetomorpha, but did test some other of the common algaes. For those interested in this kind of stuff!
https://web.archive.org/web/20040720161739/http:/www.botany.hawaii.edu/Bot482/Kaneohe Bay algae N-P Larned Mar Biol.pdf
One only on chaeto, doesnt compare to others
Search:
"chaeto linum effect of nitrogen and phosphorus supply on growth"
https://web.archive.org/web/20040720161739/http:/www.botany.hawaii.edu/Bot482/Kaneohe Bay algae N-P Larned Mar Biol.pdf
One only on chaeto, doesnt compare to others
Search:
"chaeto linum effect of nitrogen and phosphorus supply on growth"