TheRealAndyCook;4584040; said:Um, you might want to remove 50% of the water from all the tanks. Just an idea, even tho its too late
Don't think it will make a difference either way. More of the cysts land in the substrate than what stays in the water column. Even if 1 cyst remains, it will multiply exponentially. Salt + Heat will kill them all when they hatch, regardless of where they are.
Note that the fish will continue to look worse for a couple days. Neither salt or heat have any effect on cysts once they attach to fish, and when they initially attach they are invisible to the eye. As those invisible ones mature, more spots will develop. No new ones should attach once the salt is added though. As the existing spots form cysts and fall off, when the cysts hatch, they die.
Basically as soon as salt is added, whether you did a water change or not, no newly hatched ich should survive long enough to attach to a fish.
Also remember that if you do any water changes after adding salt, that you re-dose the salt removed as well. If you have it at 2 tsp/gal and you take out 10 gallons, when you add the 10 gallons back, add 20 tsp of salt with it.