Sadly, my fantail fish has swim bladder disease. It's horrible. The poor thing can hardly swim no matter how it tries. It swims upside-down and on its side, and it floats up to the top. This happened today, so when I found it I immediately thawed some frozen peas. The other two fish ate the peas, and the fish that actually needs them couldn't swim to get the peas anyways. So, I attempted to feed the fish by stringing a piece of thread through the pea and dangling it in front of the fish. But still, the fish will not touch it. What can I do?