I have a 7 gallon tank which was home to three male guppies but unfortunatley one died 4/5 days ago and the other about 2/3 weeks ago. I also lost 3 pygmy cories to this same thing. The symptoms that keep showing up are Long stringy poop (internal paracites??), clamped fins and loss of appetite. The tank has been up and running for 5 months and I presume it is fully cycled but my test kit just ran out and wont be getting another until tomorrow. I have treated for anti-internal bacteria upon seeing the poop but am not totally sure it will work as it is anti-internal bacteria rather than anti-internal paracites or is it the same thing? I will add photos below.