I noticed today my small polypterus is covered in these thread like worms all over his body. When i say covered i mean COVERED! They look lie anchor worms to me. I raised the temp and added aquarium salt. I dont udnerstand how this could happen i do weekly 50% waterchanges i have more than enough filteration and a uv sterilizer. My 3 dempseys dont seem to have any on them. Whats going on!?