Hi Guys - Firstly this site is amazing and informative but I still have a couple of queries....
I am in Canberra and in the process of setting up a AP system as follows - I have bred and raised pet fish for about five years or so but cant eat em.
A 450 litre fish tank in shed with the pump pumping up and out-side to a grow bed that will be 1100 x 600 x 300 filled with lava rock and clay balls - flood and drain type
I initially thought to ensure that the 30 or so trout I'll have in the tank have enough biological filtration that after the bed is flooded the water will trickle through a bio ball set up then into the tank of fish.
My question is should I have a pre-filter for the larger particles of **** at the top of the bed prior to the bed being flooded. Is this set up OK to build and be successful??
Cheers Luke


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