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1m x 2m stretched oval at 80cm deep is ~ 350 usg. I count 18 fish visible in the picture. Isn't lack of restraint an American trait, Kusuma? What you are attempting to do is a challenge, is not recommended and may result in heartbreaking loss.
If you want to grow them larger here are some options...
- just keep feeding them and see what happens, they'll grow,
- select favorites, give away the others, feed the same amount to fewer koi, when they've grown a year or two, 50, 60 cm?, trade them in for new small ones, start again,
- make modifications to tank and filtration to try to handle the growing fish, progressively add a bottom drain, vortex settlement, fluid beds, japmat, and tower/shower, and still end up with too much fish load in too small a tank, but have fun, have a couple big fish, and your visitors will drop their jaw in amazement. (some will think you are crazy.)
Hmm, I just remembered that when I kept too many fish in too small a tank I always ran a carbon filtration loop, hoping to suck out some of the hormones/enzymes that would relay the message among the fish that they were too crowded and that there was some natural selection to be made. Activated carbon must be changed frequently and there is debate about its use, not that it won't work, but that keeping it working well is difficult in a koi pond's water.
Mickey the windowman
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