HElp my cherry barb is having trouble swimming he is just laying at the bottom on the tank~ he looks soo helpless what is going wrong~ 2 days ago i started treating him wiht ick and yesterday i noticed he was having trouble floating i did a water change thinking maybe the meds were hurting him~ he doesnt seem to be doing bettter he can swimm only a little before he lays on the bottom please help i dont want him to die