I’m afraid you were probably right the first time. It’s not uncommon for the signs to come and go as the parasite progresses through its lifecycle. If you’ll indulge me a boring review (stop me if you’ve heard this before).
The life-cycle of Cryptocaryon irritans, the protozoan responsible salt-water ich, has five stages. When they’re burrowed into your fishes flesh, munching away, they’re called trophonts. You don’t see them at this stage, but you may notice your fish scratching itself against the rocks and substrate for relief. One of the places this stage can be detected is the clear flesh of the pectoral fins (it will look clouded).
When the trophont is ready to leave the host and reproduce, it secretes an opaque cyst and suddenly becomes the tomont,the dreaded white spot that strikes fear in the hearts of we fishkeepers. The tomont falls off, the fish looks better, and we’re lulled into a false sense of security. But the tomont is lying in the substrate dividing into 200, or so, daughter cells called tomites (cute little names for microscopic monsters bent on raising Cain in our aquariums).
Now this can take anywhere from 3 to 30 days. When the division is completed, the tomont bursts, spilling the daughter cells into the water column. At this point these cells are free-swimming hunters, called theronts. They seek out hosts whose flesh they will burrow into and start the cycle all over again.
Although your fish looks good now, I’d be wary of another round of infection
[ October 06, 2001: Message edited by: Stark ]
[ October 06, 2001: Message edited by: Stark ]