My 10 gal tanks each had Moscows. One tank I had raised here and the other was kind of a quarantine tank from the breeder as I bought a group package from him. I had had them about a week when I decided, after observing NO problems with the new fish, that I would even out the number of males in each tank.
At that point I had 7 males with beautiful purple or green tails. I now have 4 left as the tanks were both hit by a disease. All but three of the fish that I originally had survived but oh, how I hated losing those.
My ordinary every-day fish from the LFS were in the 20 gal tank. Two of the females there gave birth within three weeks of each other. Three days after the second dropped the first one dropped again, five days early.
I have now set up a 5.5 gal tank that has nothing but fry from those three drops. They all seem healthy enough and are eating well but I need to dispose of some with conformation problems, crooked tails, etc.
I now have all 11 Moscow females in the 20 gal tank, 5 LFS females in a 10 gal and all of the males in the other 10 gal because one of the Moscow males has a split from the base of his tail to the outside edge.
Good news! I had my tap water retested. And there is no indication of copper in either the hot water source or cold water source. I watched her do the test and then read the results myself after she had. So I am now gradually weaning the fish from well water back to tap water. Half of each 50% water change is now tap water. I will gradually up that until they're in nothing but tap water. So far so good.
G ma