Issues with different sizes of koi in QT

[smithvillemike]

I am seriously considering a 70cm Kohaku. My question is my QT is a 6' show tank that I planned on keeping my 2 SU's in through the winter. Considering the SU's will be in the 10-15 cm range. If I do this, what kind of problems, if any, can I expect other than making sure the little guys get enough food.

[Bob Winkler]

actually the bigger koi may be more likely to be food shy, but probably not a huge problem either way. At least for me it has been that way when sizes this far apart are mixed. Consider adding a medium sized koi if you like.

You probably know this already, but also consider that the lil guys will have to go through all treatments the big one needs....ie more stress.

[Auntiesue]

Like Bob I don't see a real problem either. I've often put different sized fish together in one Q-tank. If they feel safe they'll get the food they need. Like Bob, my experience has been that the larger fish tend to be a bit more shy about food when new to their home. Also treatments that may be required as Bob mentioned could add more stress to the ones already in the tank. Generally you should be fine.