"Linda H" wrote in message
...
meeee wrote:

..DH wants to do (I can't remember the long name) the fish growing thingy


Aquaculture?

Sort of but more complicated..... a hydroponic system and aquaculture system
all linked, so that the fish water flowed through the hydroponic gravel, the
plants removed the poo etc then the now-purified water was pumped back in to
the fish. There was beneficial bacteria involved, in the gravel I believe,
and he was working on growing his own pond weed to use as fish food, so that
it would be completely self sufficient. DH got all inspired and wants to do
it now