>From my experience also. When I over softened my water (mixing RO and
tap) I got batches with 100% fin and spinal deformities. If I add HBH
Balance Blocks to the water this problem goes away.
Now this does have more than just calcium in it, but obviously
something is missing from my water if its diluted down with RO water
too far.
Cary Hostrawser
Minnesota Aquarium Society
http://www.mn-aquarium.org/
Rainbowfish Study Group of North America
http://home.earthlink.net/~sbuckel/index.html