I don't know about that product, never used it, but I don't like products that are for both fresh and saltwater. Ich in saltwater is different from Freshwater, and unless there is copper in it I'm not sure it will work. Also you can't measure the amount that you're treating, since some of it will be absorbed by the rocks and sand you wouldn't be sure if you're dosing the right amount.
Even though you have decided on the treatment you will be using for your fish Awilda, I would like to add the following information to this thread...
Regarding treatment with copper...yes, there is a difference in the ich parasite between fresh & salt water. In SW the parasite is Cryptocaryon Irritans and in FW it is Ichtylophthirius Multifillis..but they are BOTH treated almost identically.
The life cycle in the SW parasite lasts longer than the FW parasite.
FW fish respond very well to treatment with Formalin, Malachite Green (or a combination of the 2) and also to copper, or to raised temps and a darkened tank. FW fish cannot be treated with hyposalinity as it will kill them, they can only tolerate a SW dip at best.
Mike - I highlighted your quote because of the risk of adding copper to a FOWLR tank...Live rock, crushed coral, sand substrate will ALL adsorb copper, so it would be near impossible to keep a proper dosage level in the tank, so I would avoid this as a treatment method unless a QT were used and even then Awilda still has the issue of her eel.
ALL SW fish including eels CAN get ich, though many are not suitable hosts for it based on lack of scales or thicker than usual slime coats. The Trophonts (the 'salt' like cysts you can see on you fish when they have ich) do not multiply as well on scaleless or heavily slime coated fish and you simply may not see them due to their tiny size (because they are hardly multiplying), but they are there none the less. They will fall off the body of the fish faster since they are not in an ideal environment,
but the ones in the gill tissue, which is where MOST of the damage that kills fish with ich is found, will still be there, so treatment is necessary for ALL fish in the tank.
I think the choice of hyposalinity is an excellent choice for your fish Awilda as long as you decrease the salinity slowly and after treatment, you raise it back to normal levels in an even SLOWER manner (your messing with the fishes kidneys here...). I know it is suggested to be 1.009 - 1.010 at 78-80 degrees for 14 days..past that point you are taking chances, so take another week after the 14 days to raise it back up. This is important due to the osmotic balance in SW fishes.
I also agree that products that claim to be the end all-be all for treating a myriad of diseases belong in the dumpster.
One last thing, I feel the use of an airline is always best when treating a fish that has almost any malady, especially one like this where gill tissue damage is likely.
...and...Garlic will NOT cure ich, never has, never will, it will however boost the immunity of your fish which is always helpful, and it just might remind you to call one of your Italian friends who you haven't spoken to in a while...lol