Cycled 10 gal planted tank with 5 neon tetras. Just did a water change before adding 2 new fish yesterday, all my readings were normal, 0 ammonia, 0 nitrates, except my Ph was a little basic because of the plants I'm guessing. So I added some API ph down. New fish: a baby bristlenose pleco (who is doing great) and a swordtail male.. swordtail was able to jump out of the 1.5inch gap between the tank cover and the filter at some point in the early morning before I woke up. I saw that my new fish wasn't in the tank and freaked out and found him on the floor. He was still alive! I put him back in the tank and he was swimming around fine, but I had to go to work so I covered the hole. I returned home and the tank was covered in white poop strings. He is pooping white long strings everywhere and hasn't stopped yet. Now I am reading it could be parasites...or maybe stress? I have no idea what to do because he seems fine except the poop.