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Manitou Designs wrote: Ok, here goes my 2 cents...
"When your using the grow beds you're removing a lot of soil biology that normally would interact with the plants. Does that have an effect on the benefits the plants offer im not sure."
I am a newbie and not practicing aquaculture at the moment, but I have stocked my library with all kinds of books related to the transmutation of elements by microbes and plants, to the importance of creating vortices in water which can generate electrical charges which then assist in the creation of colloids (nutrients which are more easily absorbed by plants).
With this in mind, heavy metals and toxins can be neutralized by certain water plants making the issue of using plastic or PVC piping the lesser of evils in aquaculture. What is really dangerous is the anaerobic conditions where the bad bacteria live. Aerating by bubbling or letting the water fall from a higher level mimics the effects of naturally occuring rapids in a stream...thus creating a filmy colloid around microscopic particles which are easily absorbed by the toxin-loving plants.
I found that taking the time to study Nature reveals many answers to our questions.
If you are raising freshwater fish, like tilapia, go ahead and find a local creek or stream to introduce biological micro-organisms... even the mud has beneficial microbes. And introduce these with the filtration tank and purifying plants. I have included a link which will explain more thoroughly:
http://www.thegreencenter.net/