@alex

Neil, if you look at the bottom of this page you will see a couple of threads about this, Open them and have a look, there just might be some information you need and maybe one or more of the posters is still active here. One is quite old the other is just last year. look for similar threads. actually I think it will be under your opening post.

JP Just a thought matey.

 

I did set up an aquaponics test system a few months ago. Just to gather knowledge of how to do it right and see how it worked out.
It's in Valencia, but we are in Sweden over the summer. If you have any questions I can do my best to answer, but I will not be there to show it until September, at which point I'm not too convinced the plants are still alive.