According to Hans Baensch (Baensch Marine Atlas 1) available on amazon:
"Cryptocarion (Marine Ich)
The causative agent, Cryptocarion irritans, is a ciliate. Externally it is very similar to freshwater Ichthyophthirius multifiliis (white spot, ich). For this reason, Cryptocarion is sometimes called Marine Ich.
Cryptocarion tomites attack fishes by attaching to the skin. However, these are significantly larger than Oodinium tomites and, therefore, easier to see(size of a pin head). As with most ectoparasitic infestations, the animals scratch themselves on objects and have a heightened respiration rate.
After a few days the parasites drop off and form cysts. The organism undergoes cellular divisions within the cysts. After approximately 8 days, numerous tomites emerge. Cryptocarion is suseptible to medication during its tomite stage.
We recommend the following procedure:
1. Prepare a high quality sea salt for a partial water exchange; areate 24 hr.
2. Remove 1/2 of the tank water and discard.
3. The new seawater (or well matured water of a lesser quality brand of salt) is placed into the tank until it is 3/4 full.
4. Top-up the aquarium with freshwater (tap water or water processed through reverse osmosis) that is free/low in nitrate until the aquarium water has reached a specific gravity of 1.017 to 1.018.
5. Add TETRA MarinOomed.
Lowering the salinity is usually safe for invertibrates; only crustacea such as shrimp and lobsters are sensitive."
Hope this helps...