007 very funny you mention that.
There is an ongoing thread about european practice (zeovit) The entire system is designed in creating a very nutriant poor environment.
I am currently using one of the products of the system. (zoespur). The product I am using is designed to reduce zoozanthale(sp) in corals.
I have always produced very light coloration in the tissue of my corals, however ; this has made a big difference in the darkness of the tissue. not to steal a quote, but it seems to be a "controled bleaching" There is not a spec of brown on most of my corals. We will see what happens.
In the next month or so, i will probably be converting completely to the zeovit system.