I got my 18 zebras from 4 sources the first two weeks of January. Some where really small, barely 3/4" and some 1.25-1.5". I have them all in a 20 gal long tank. Since I was afraid there would not be enough food for the smaller ones, due to the pecking order; I started overfeeding at night. Ever since...in the mornings, religiously I've been changing the water about 20%. In about a 1 1/2 months time I've notice a significant growth,, I would say they are all at least 1" now, and the bigger ones, well bigger.

All their bellies are nice & round, exceptionally hungry at nights. I'm already cycling another tank to split the group.
From the Discus people, I learn about daily water changes. Commerical breeders in Asia change as much as 100% of the water daily and they swear that this helps & accelerates growth...can't argue with success.
A couple of years ago I had another colony of zebras where I performed weekly water changes & didn't grow as fast as these are growing. Am I the only one doing daily water changes? If somebody else does...please share your experiences with me... Thanks. Dan