urbanfarmer is right. His post [Posted: Sun Oct 10, 2010 10:10 pm] mentions that some aquarium plants can sell for quite a bit. I was watching a reality TV show one night and one fist-sized lump of coral was elling for almost fifteen thousand dollars. No joke! A lot of dough, but it might be a slow growing process. I posted this to another forum on the subject:

I found this link which says that corals like a high ph:

http://www.coralscience.org/main/articl ... reefs-grow

This paper says that too high a ph could inhibit the rate of photosynthesis in seaweed, due to the high ph causing lower CO? levels:

http://www.nrel.gov/docs/legosti/old/1820.pdf

I want to try this as well. It looks really interesting, and if one could successfully raise coral, you could make some really good money. Some people will pay top dollar for prize corals for a decorative fish tank.

So in freshwater aquaponics, algae and a high ph is your enemy. But in saltwater, it is your friend!

I hope this helps -

UPDATE: I found this BBC story on a saltwater fish farm in the Sahara, pretty interesting:

http://www.bbc.co.uk/news/world-middle-east-19942183