Usually people use : fishtank with Tilapias (super resistant fish) --> particle filter --> biofilter (real easy to do) --> plants.
The fish poop passes the particle filter, than the biofilter where the microbe community is will synthesize the nutrients into a form your plants can absorb.
@GreenOrganicGermany "mud collecting" is a bit more sweaty but basically saves you the need to build something and works the same way.