A few days ago, I was looking at my guppies and noticed that it had something coming out of one of their mouthes. It looks almost like a hair. When I first noticed, it was about 2 inches long. It is now about 1 inch long, but he has clear poop. I tried taking a picture, but nothing was coming out clear. A little about my tank: 20 gallon tall 10 months old Temperature is around 80F (it has been very warm in the house. I have heater set to 76F) Ammonia 0, Nitrites 0, Nitrates 0 Used API Freshwater Test Kit PH 7.8 20% water changes every other week Medium planted 3 guppies 7 neon tetra 1 Otto Any idea of what it could be and HELP him?? Thanks in advance!!