Hi fatbobsufc
I keep hearing about people predicting dire things for anyone feeding live food, but I also know that the lfs sell an awful lot of them.
And, I've never known anyone who actually had a disease in their tank because of them. I think that it's very important to clean them when you bring them home and refresh them with another rinse daily.
To clean them, I use a 2 cup measuring cup that has a little spout to make pouring easier. Just add the worms and run cold tap water into them; they will separate and swirl around. Let them settle for a minute or so and pour the dirty water off. Repeat this procedure several times until the water runs out clear. Then pour all the water off, except for en ought to just cover them and store them in a covered dish in the refrigerator. Don't buy more than a few days supply at a time so that they will be at their best until they are used up.
Cory eggs are white, and the bronze corys are quite prolific. I keep my tank at 80 degrees to keep them from spawning because the just kept doing it and I was afraid they would wear themselves out. When they are big enough to breed them, you will want to put them into a breeding tank, anyway. This way the eggs won't get eaten by the other fish and they can be raised right in the tank they are spawned in.
If you scroll down on this thread you will see how I set up a breeding tank:
http/fish.orbust.net/forums/index.php?ac...t=0#entry199536
I'm not really sure how pH affects their spawning, because I've never wanted or needed to change it. I suggest that you try with what you have since they are used to it. If they mature and still do not breed after doing things like water changes and temperature drops, then you might want to try altering it as a last resort.
BTW, how big are your corys now, and can you tell which are males and which are females?