Search and you will find my opinions

All I can recommend is Julian Sprung’s speech (on video) from 03 IMAC conference.
http://www.theimac.org/juliansprung.htm
I learned a great deal and nothing all at once.
I agree they need “dirtier water” They come from lagoon zones.
Thus more fodder in the water column. But unlike above I go for less light.
IMO they tolerate MH’s but where they come from is an area where there are sand storms, and heavy storms clouds shading out some sunlight.
I have viewed that video 4 times since IMAC and for the $30 it’s worth it IMO
S