I have two discus that are dark, scraping, floating sideways on occassion, and have shown some skin problems. they often clamp their fins as well and show liitle appetite when fed. My PH is 6.8, and i have a slight ammonia problem. i have tried one fungus treatment and a one parasite treatment. i am scared to try any more meds until i can find the real problem. I am currently adding ammo lock for my ammonia problems. HELP PLEASE!