Copy-n-paste the troubleshooting form here, and answer it to the best of your ability. Pictures would likely help, too.

But mild to moderate yellowing is normal during flower. But if leaves are falling off, (not a good thing) there might be a few different causes, one of which may or may not be from nitrogen or the Schultz. Very doubtful it's the nitrogen though. The Schultz has a ton of it.

How long have they been in the same pot?