Hi Thiam,
Thank you for your very honest opinoin
1) IMHO, a gravity fed gravity is only efficient when there is a bottom drain provided to collect the
koi's waste product. I think in your case, the mid-level outlet from the QT has been placed too high for
taking in the waste product. You may consider extending an ' elbow connector ' to be position at the base
of the QT for it to be more effective. Actually the pic don't do justice coz I used camera phone. But if you look carefully there is an elbow there . This pic will should show you more.
2)The returning water outlets from the drum filter pump should be placed at the opposite end of the QT's
outlet so that the incoming water besides providing current will also help to push the waste product towards
the QT's outlet. I've done a test and it shows that having the return where I have now is more effective than if the return is on the end. This is due to the length(not long enough) and the depth(too deep by leanght) The water bounces off the other end wall then down then back(see pic)
3)Please also provide plenty of aeration becos' this will not only help to provide the fish with a supply of
oxygen when they are stressed, but it will also help to gas off the excessive waste products that maybe
produced by the ineffective digestive system from a stressed out fish. Don't worry Thiam, you know I will
but atm I will be using a small pump with venturi until the minister approve my loan
4)Lastly, regular water changes is one of the most important elements of maintaining a successful
quarantine system. If we don't do this might as well forget about the whole thing
rgds,
Jon
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You can see the water exit point on the right. 
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