[url=http://aquariumpros.com/aquaprostore/prods/ATRT17H.shtml said:
Aquariumpros Formalite I[/url]]
A fresh and marine fish anti-protozoan agent. Prevents and controls external parasites on fish. Safe for all but scale less and silver-scaled fish. For these, use Formalite II or Formalite III (Shown on this page). Use 1 drop per gallon. Anti-protozoan agent that controls external parasites. Treats collapsed fin body shimmy, white body blotches, Ich, Oodinium and white spots. For use in fresh and saltwater aquariums. Do not use with invertebrates. Contains: formaldehyde, malachite green, and copper sulfate.
[url=http://www.aquariumpros.com/Merchant2/merchant.mvc?page=APG/PROD/MDgn/ATRT231H said:
Aquariumpros Formalite III[/url]]
A colorless fresh and marine fish anti-protozoan agent. Prevents and controls external parasites on fish. Safe for all fish. Use 1 drop per gallon. Anti-protozoan agent that controls external parasites. Treats collapsed fin body shimmy, white body blotches, Ich, Oodinium and white spots. For use in fresh and saltwater aquariums. Do not use with invertebrates. Contains: formaldehyde, copper and nickel sulfate.
According to the website with this product info, the ingredients are NOT the same. You should use the Formalite III in a
QT tank/
QT container to prevent your main tank from staining; although it looks like Formalite I would stain due to the malachite green.
An aside: Please read the information provided in the answers to your questions, so others do not have to repeat it. The best fish keepers are the ones that can find answers and use the guidance given here on Aquarium Advice.
Now get to the store, get the propper meds and help your ill shark