> health problem pop up. So I doubt that letting these particular two
 > half-siblings breed would result in deformed or sickly babies.
 > 
 > Does this sound like I'm seeing thru rose-tinted glasses, or does 
 > this
 > plan make sense?
To be honest, I think you're looking through rose-tinted glasses. As you 
know, you won't necessarily see any genetic defects until you line-breed. At 
the very least, it can result in small babies.  At the most, eggs won't hatch 
or the babies may be sickly and have shortened lives.
I'm sure you would not consider line-breeding cockatiels. Why would this be 
any different?
--- FLAME v1.1
---------------