Various Symptoms

You won't believe this but I have a fancy-finned goldfish that will
display swim bladder symptoms if I feed him anything but frozen
veggies (thawed, of course). When he first showed symptoms I did a web
search and found out about the frozen pea trick - you feed the fish a
thawed, well cut up frozen pea(discard the pea's outer shell first).
Then you can also fast a day or two.
The pea worked. Problem is - whenever I gave the fish regular food
or thawed bloodworms or brine he would stay at the top or bottom and
show signs of bladder imbalance. As long as I keep him on veggies he
is fine and swims happily. Can you believe?
SuziCreamCheese - and PS, water quality is not an issue with me. I
maintain many tanks and have years of experience!