Hello; Two of these statements got me to thinking they do not match my understanding of the parasite we call ick. First being that the parasite is present at all times . That is not my understanding. Ick is a parasite and as far as I know it can be eradicated from a tank and it does not hang around in some way waiting for proper conditions. My take has been it must be introduced.
I also have questions about the use of a half dose of salt. My understanding is that the salt concentration has to be at a particular level so that when the free swimming stage first hatches out of an egg the osmotic pressure difference will kill it. The basic take has been that too weak a concentration is pointless.
I am not expert on this so did a brief search and found backup for my notions in the following link.
https://en.wikipedia.org/wiki/Ichthyophthirius_multifiliis
I also get that this subject appears to have a lot of conflicting information floating around. I do know there are many threads about ick (ich) in this forum and there is sort of a consensus that the heat alone is not enough and that some sort of meds needs to be used. Too bad such a state exists and that we cannot get straight credible information.
Good luck
Ick may have different strains which are virtually ubiquitous in ponds, lakes streams and other natural freshwaters, but it cannot survive in those waters above a certain salinity or above a certain temperature. (Freshwater ick).
Once introduced to a tank, it can be eradicated. But the tank must be treated ... that is, the water - not the fish.
It's unfortunate that
Rocksor
gave spot on instructions and they weren't followed out. Also
kno4te
.
Treat tank with 3 teaspoon salt per gallon at 86º. Continue treatment for 10 full
days after all ick has disappeared.
I submit that you probably know more about ich. It does sound that you are correct and that it can be eradicated after a thorough proper treatment.
In practice, however, every new fish, plant, invertebra, etc. introduces ich back into the tank from which it was supposedly cleansed out. That is unless you subject every new fish, etc. to the ich-killing treatment in the QT tank. But people don't do it unless it does show ich. And many don't do it even if it does show a mild case of ich because in the absence of any stress, a healthy fish overcomes ich without any help, again most usually. There are always exception but let's leave them out for now.
I stopped treating for ich a long, long time ago while I had been the first to worry and start treating right away before that.
Thus, my statement needed to be corrected and I thank you for it but in my tanks and practice it stands. I don't subject every new fish to an anti-ich treatment at all, whether it shows it or not, so ich is always present in all my tanks.
From here on, I believe the rest of my spiel to hold water.
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As for the half dose of salt... I said "start out" and "observe closely". If all's adequate, I increase to the recommended dose. If not, I may choose longer time, higher temp, or an alternative treatment.
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Hope it makes some sense.