I started off with thousands fancy fries. OMG!
Then a week or two later, couple hundred Koi fries. Double OMG!
Now, lots of fries still alive! (Details in signature)
I would have more if I did not place a few hundreds in my pond. (Water temps might have been too cold).
If I had hatch brine shrimp to feed them early on. (Lots of them die from lack of food)
Thousand got suck up in my Jerry rigged- power filter. Oh well this is part of a learning process.
One thing I like to say I spent a lot with this fries, love watching them grow (wishing that they would grow a bit faster). Divided into many tanks.
The fries grew faster and bigger with a small tank with less fry, even though the water quality was not better high nitrate levels.
My 10 Gallon tanks have the biggest fries double or triple the size of some from the 29 gallon and 75 gallons with lots of fries.
The 10 Gal fries are all about the same size.
The 29 gal fries varies in size greatly.
So my conclusion is to rear a few fries in many small tanks rather then to house all of them in a bigger tank.