sunset wrasse help???

hey guys. ive got a sunset wrasse for about 4 months now... i saw it flinching and tryin to slam itself to the front glass.... it stils eat and swims fast... and somtimes it floats vertically for no reason... anyone hav any idea?? my tank has no ground probe... however the rest of my fish are swimming healthy and eating healthy?? could it be the diet??? i practically eats nethin i put in the tank... including veggie and nori...
help please... should i be worried?

 

sound like a unhealthy fish to me , but some fish do have funny swimming patterns Do u have a Quarantine tank so u could watch and maybe asset the situation ?

 

ok... i dnt have a QT... within the 4 months i had him... it hapens bout once a month and then stops... nd then now its bak...

 

i know freshwater fish do that when they have ick im not sure so bump

 

ok... no signs of any disease..dats visible as far as i no... thnks for the input mate...