Slime Disease
Slime disease isn't actually a disease. It is caused by parasites. There are three different parasites that can cause these symptoms, Chilodonella uncinata, Costia, and Trichodinia.
Symptoms
The symptoms of it will vary with progressing stages of the parasitic attack. On normal, relatively healthy fish, it may just appear as if the slime coat is sloughing off. On fish that are stressed or have weakened immune systems, it will have more symptoms, such as heavy breathing, lethargy, flashing (trying to scratch itself against aquarium objects), and will refuse to eat.
Where it is found
The three parasites will very rarely infect your indoor tanks. They are most commonly found in pond and swamp waters. However, these parasites act as facultative endoparasite of three different kinds of mosquito larva, the Culex, the Aedes, and the Anopheles. A facultative parasite does not necessarily rely on a host for it's food source; it is known for having a separate life, independent of the host, and for having a host to feed off of. An endoparasite is a parasite that resides inside the host's body.
Larva Feeders: Beware!
The parasite can be transmitted through the food you give to your fish. Although mosquito larva is an excellent food for your fish, be sure to rinse the food well (in clean water) before you give it to your fish. Because it also has an independent life cycle, the parasite can also be transmitted through the water, so rinsing is a MUST. Once it is in your fish tank water, it has to be treated extensively.
Why Worry?
I included this extra page on Slime Disease because of this: These parasites are MORE DANGEROUS THAN ICH. Ich is a serious killer that can easily take the lives of all the fish in your tank. Slime Disease is silent; it's deadly. You might not notice anything wrong with your fish until the symptoms have progressed. By then it will be too late. Chilodonella is especially resitant to treatment, so mortality rates are HIGH. This is one of the reasons why you should take extreme caution when feeding your fish live foods.