2 week old baby angelfish keep dying

I am hoping someone can help me figure out what is wrong with our baby angelfish. We have recently moved and are now using well water. We had a batch turn out just fine a year ago with city water. We had about 30 babies and had no apparent problems. This batch had about 40 swimmers and now they are dying about 2-4 a day and I am not sure why. Could it be the water? We do water changes daily, but only about 25%. We clean the tank daily and feed them 3 times a day. We weaned them off the brine shrimp. Although, the fish were dying when we were feeding them brine shrimp. We keep the tank at 82 degrees. We do have lots of hard white particles that we have to scrape off the heater and the tank sides. Right now we have only 8 babies left. They are starting to look like angels with the fins popping out. What should we be doing?

HELP!!!

In my previous reply, I didn't ask about your experience level with angelfish. They're a little bit fussy, and people use different techniques to raise them. The topic makes for a good discussion.

I have had adult angelfish all my life. Raising them has only been the past year. We had a mishap where we got a sick fish from the store and it caused our mom and dad to pass away. So we only have the 30 babies from the March fry. They are almost a year old now and two of them started to mate. I am wondering if that may be a problem also.

It sure could be. A spawning pair of angelfish will become territorial and very aggressive. They will need their own aquarium of at least 20 gallons capacity if you want to raise fry. My own method is a bit unconventional and not nearly as productive as hand raising, but it's much more interesting. I let the parents take care of their eggs and fry until just before they're ready to spawn again. At that time I move the parents to their own aquarium and let the fry grow up. The fry get live baby brine shrimp from an in-tank hatchery, and that's supplemented with frozen baby brine shrimp. Many times a new pair will eat their fry or eggs, but some stop after a few spawns.

If you want more details, just ask.