[PapaBear]

If you want to do this in 30 gallon tanks you'd better get about 30 of 'em... They'll be dieing off in huge numbers real soon, so between the water poisoning them and the tobies chowing down on sibling sushi your population problem will take care of itself real soon. Get a bigger tank (LOTS bigger), get plenty of air going in, separate the tobies from the rest, and start tossing anything that has missing or defective body parts asap. Do that and you might have a few survivors.

Quote: Originally Posted by koiboy472004 Hello everyone! I have about 20 koi of all sorts, not sure what kind they all are but I just love'em . On july 10-08 about a week ago my fish had a spawning frenzy,eggs everywere all over my Water Hyacinths , so I had this bright idea of trying to hatch baby koi I took an old 30 gal glass tank cleaned it real good and filled it with algea water from the same pond then put the water plants with eggs all over them in the tank then added an air stone and a small filter with a fine mesh bag around the water inlet. And PRESTO 3 days later, I guess about a couple of thousand 1/4 inch baby koi stuck all over the glass , I thought COOL I'm the proud parent of a bunch of baby fish!...? The baby koi are eating well there green algea and some finely ground up koi food so things are going real good so about 4 days later my fish spawned again I took the first water plants out and put new plants in the same tank with more new eggs on them and PRESTO again another couple thousand baby koi stuck to the glass . GREAT now I have twice as many first batch about 3/8'' long and new ones about 1/4'' long I thought this was really neat until I saw one from the first batch eating one of the new ones. I never thought there would be that much differance in size were there would be a problem. Should I just let them continue or is there a way to solve this ANY HELP APPRECIATED .