What I like about Quick Cure is it uses a proven effective combo of ingredients. The directions state:
Remove carbon from filter before use.
Add 2 drops per gallon daily (do not discontinue filtration) for all fish except those in the tetra group.
FOR TETRAS: Add 1 drop per gallon daily.
FOR MARINE FISH: Add 2 drops per gallon daily in a bare aquarium.
Replace carbon 24 hours after last treatment. Maximum dosage: 3 daily treatments. If further medication is required, perform a 25% water change before administering another treatment cycle. Water will turn blue during treatment. This is a temporary condition and will disappear in a few days. Change 50% of water if fish show any signs of distress during treatment or an accidental overdose of this product occurs.
(Bolding added by me.)from
http://fritzaquatics.com/product/quick-cure/It says nothing about scaleless fish.
Most ich treatments require exposing fish to the med for longer than 3 days. The reason is that Ich has a three stage life cycle and many treatments will not kill Ich in all three stages. However, the combination of Formaldahyde (Formalin) and malachite green is. The problem with these ingredients and the reason why so many others have been tried is that they are banned for use in the food fish industry. So unless you tend to or plan to eat your fish, they are OK to use in out tanks.
Formaldehyde + malachite green
In vitro 25 + 0·1 mg l− 1 for 24 h Adults** Effective – 100% mortality after 24 h Wahli et al. (1993)
100 + 0·4 mg l− 1 for 24 h Effective – 100% mortality after 24 h
25 + 0·1 mg l− 1 for 24 h Tomocysts Effective – 100% mortality after 24 h
100 + 0·4 mg l− 1 for 24 h Effective – 100% mortality after 24 h
25 + 0·1 mg l− 1 for 3 h Theronts Effective – 100% mortality after 30 min
100 + 0·4 mg l− 1 for 3 h Effective – 100% mortality after 5 min
(Red added by me.)from
http://dspace.stir.ac.uk/bitstream/1893/10147/1/Picon%20Camacho%20et%20al%20Parasitology%20Ich%20chemo%20review.pdfBtw, that last link links to a paper which pulled together information on more Ich treatments than most of use ever imagined existed. It looks at them in the wtaer, in a dip and in food. It looks at how each worked on the various stages as well.