Most Effective Treatment
HYPOSALINITY is Osmotic Shock Therapy [OST]. O.S.T. places the infectors [ich] in an environment in which they cannot hope to survive while the host, (or infected fish) can. This remedy WILL NOT work in reef systems or invert tanks as it incorporates lowering the specific gravity of the entire aquarium to 1.009 SG or to 14-16ppt [parts per trillion] salinity---this SG/salinity being too low for inverts, LR or LS. Marine invertebrates have the same osmotic concentration as the surrounding water and if placed in hyposaline conditions they will likely die of osmotic shock. Likewise, this procedure should not be used on sharks/rays, only boney fish. The procedure, can, however, work very well in strictly fish-only set ups.
The method of lowering salinity/SG is simple: Over the course of 48-hrs, salt water in the tank is replaced with fresh RO or DI water in several, but small increments until a SG of 1.009/salinity 14-16 ppt is achieved. Maintain pH, as pH tends to lower in hypo-saline water; you need to maintain a pH which is safe for marine fish and consistent with the levels in the display/hospital tank. The best instruments to use for measuring specific gravity are refractometers or high-quality, lab-grade glass hydrometers. The reason these instruments are recommended is because of their precision and the need to be very precise in attaining therapeutic SG/salinity for the procedure. Never use plastic sing arm type hydrometers. They are basically useless for this procedure, and, really, they are so inaccurate that they should not even be used for routine salt water assessment either. As to the beneficial microbes you rely upon to provide natural filtration in your aquaria/QT, NOT TO WORRY! The bacteria colony will survive, the fish will be more than fine; Ich, however, will not survive. By lowering the salinity, you will also be lowering the osmotic pressure of the water. The parasites NEED high osmotic pressure to convert saline water into freshwater. All marine animals need freshwater as we do [these parasites are considered marine animals as well, BTW]. They just convert it differently, usually via their tissues. Reduce this necessary pressure and the ich will die. As a higher life form, the fish will do fine with this short-term treatment. Preference for this treatment of ich over copper is based on toxicity. Hyposalinity has no ill effects on fish during or after treatment, whereas copper is a toxin, and could have enduring negative effects on fish even following a successful treatment.
Maintain the 1.009 SG/16-14 ppt salinity in the tank for 3-4 wks AFTER no visible signs of ich are present with your fish. After that time, you can slowly, over the course of several [5-7] days, raise the salinity back to normal levell. Take longer raising the salinity then you did lowering it. If the fish are in a separate treatment tank, leave them there for 5-7 days after returning the salinity to normal levels. If the fish are well after this time, then move them back to the display.
Copper Treatment is highly effective when applied precisely and monitored closely. The drawbacks to copper, however, unlike hyposalinity, is that copper is a toxin---to both parasite, as well as your fish.
In this treatment, the hobbyist will use use [best choice] Cupramine which is manufactured by Seachem. You will also need a compatible copper test kit that will “work with” the copper. If you use Cupramine, then also select Seachem’s copper test kit.
You should always set up a hospital tank, never adding copper directly to your display. At all times, maintain therapeutic copper levels in the hospital, using the copper test kit daily. READ THE LABEL of your medication and follow the directions. Like hyposalinity, copper treatment requires precision. Not enough copper, and the treatment is ineffective. Too much copper, and the treatment could be lethal to your fish. Take care, be attentive.
The treatment course for copper is 3 weeks after you have attained therapeutic levels. Following treatment, you should leave your fish in the hospital tank for an additional week for observation.
What else should I do during treatment?
Continue common sense maintenance practices. That means water changes, water quality tests, etc. In this case, while treating, you will want to perform water changes that match the water in your QT. If your tank is under hyposalinity, then the water you change out, must also be at the same salinity/pH as the water you remove from the tank. Likewise, if you remove copper treated water, then the water you put back into the tank needs to be copper treated as well, at the the appropriate therapeutic level.
