I wouldn't treat for a disease unless you're positive your fish has it(like visible small dots). Treating a fish with meds before knowing the disease may only further stress a fish and make it more suseotible to disease.
Fish will flick for many reasons, one being ich, another could be something wrong with their environment. Test your water for ammonia, nitrites, and high nitrates that could be bothering your fish. When i saw my fish "flick" awhile back it was because of elevated nitrites.