UPDATE

I have been doing some tinkering with my system. The whole system occupies a foot print of approximately 3 square meters.

A 5.5k L/h pump runs 30/30.

One IBC cut BYAP style FT1

Two 225L olive barrels ( 1 vertical 1 horizontal) sumps

One 250 L (UK loft cold water tank) FT2

One 200 L GB (cut from IBC

Two 40 L GB

One 90 L GB

One 60 L GB

One water cooler RFF

One up flow static filter (K1)

One 10 L submerged horizontal bio filter(K1)

One DIY pre filter 10 L

One DIY bio filter 20L (bio balls, Rawl plugs and bottle tops.

The oblong GB 2*40 1*90 are stacked vertically above the horizontal olive barrel sump. These will be covered with a plastic greenhouse. Readily available here in the UK as Tomato houses 100 wide 50 deep 150 high.

Site conditions prevent me from sinking sumps into the ground This will be above the horizontal sump. A maximum height of 2.44 M  Yes, step ladder. Yes, warning light for low flying aircraft.

With the use of an additional pump FT2 can be isolated as a quarantine tank.

IMHO an essential in any system.

Filtered by the two DIY filters.

Fish are being introduced in batch of 15. As such the maximum at any one time will be 45. With a mean of 30.

The RFF (25L) is small. It only serves the IBC FT1

I can immediately see debris build up. I place another 25 L bottle on the outlet and drain it in less than 20 seconds. Allow to settle. Pour back 95% of the water into the GB and use the remainder on the soil garden.

In practice about once per week.

The up flow static is new so limited experience yet.