Hi, Ive been keeping discus for a lil bit over 1 year now. I got 20 discus in a 100 g tank and are about 4-5 inches big. The water is about 80F and with the ph of 6.5. There are no amonia and nitrates present in the tank the last time ive check. i change 30 to 50% water daily with ages water. I feed them Choped beef heart, brine shrimp ,frozen blood worms,Tetra Color Bits , and Hikari Discus Red . Last week i was watchin the tank after a water change and ive notice 1 of the discus have a white stringy transparent poop. Ive never seen this b4 and i kinda just forget about it. After 1 week almost half of my discus has it, and some dont really eat and just hides in the corner. Their color seems ok, But i never really have a problem like this b4 and im thinkin it has to do with an internal parasite.If u can help me withs problem and can give any advice or any medicine. that would help me a lot thank you.