Hi
As mentioned in my other threads, I decide to set up a (low cost) grow out for the totally unexpected fry I got this year (after only 1 year with koi).
I used an IBC a friend gave me, an old fluval fx5 (probably 10 or 12 y.o.) and two plastic boxes drilled and filled with expanded clay as a shower.
The media I used was already cicled in the main tank, so I only have to colonize the sponges of the fx5 and the expanded clay of the shower. I used 50% old water and 50% new.
To start and properly colonize all the midia I only collected 13 fish, 10 of them being the very dark ones I have in the tank (the vast majority of the fry). I left most of the prettier ones in the tank that will be collected in 2-3 weeks
They had this color in the tank:
Here is a brief video with the system in place (comments in portuguese...sorry):
And a few pics of 13 settlers:
this one is peculiar