I guess you were right. ALL of my fish are getting the same symptoms. skinny and the top spine humped over. this is fish TB or something
. my poor male gourami had to be put down yesterday, and one of my male platies (blue one) is showing the signs of humped head and looking thin, however he is still acting normal. I tried internal parasite med and pease with no luck. I guess there is nothing i can do 

