Hi everyone - another fish health question here! I noticed one of my new platies with white poop and read a little about it - could this be a parasite!? I got this one and two other platies two days ago and all seem to be acting fine, but this one has had white stringy poop yesterday and today. Have not noticed this with any other fish. Ammonia - 0 Nitrite - 0 Nitrate - 10. Water temp 73.5 degrees, 20 gallon tank. Thanks so much in advance for your help!