Found this Methylene Blue article, and a place to purchase. I know you do not need it now, but maybe for future reference.
I do not know this particular website or company, but it looks pretty reliable.
METHYLENE BLUE (Zinc Free) 2.303% :
A heterocyclic aromatic chemical compound with molecular formula: C16H18ClN3S.
For use to treat Fungus on eggs, Ich, Saprolegnia and some bacteria (although generally not for use in bacterial infections other than as a bath/dip/quarantine therapy).
MB is effective in treatment of some gill diseases, especially from injury such as ammonia burns or fluke damage as it transports oxygen allowing for more gill efficiency and as well aiding in some healing of tissue.
Probably one of the best “first response” treatments when used as a bath or even dripped directly on a fish for both internal and internal injuries and infections. Generally used as a 30 minute bath/dip at double dose, in fact Methylene Blue has a wide safety margin and is nontoxic when used as recommended. Fish tolerate relatively high dosages of Methylene Blue without side effects.
Very effective when used as a dip for topical treatment of parasites, fungal, and some infections. When Dylox is not available, this can a useful treatment for anchor worm (especially in goldfish); first carefully remove the anchor worm with tweezers, then dip the affected fish in Methylene blue. When used with a UV sterilizer to kill the swimming stage of the female anchor worm (the female is the parasite), this can be an effective treatment. (Tank can also be treated with Malachite green or malachite green combination during this time for improved effectiveness).
Methylene Blue can also treat some protozoa (such as Oodinium, although only a mild treatment for this but it can be more effective when combined with other chemical treatments such as in Medicated Wonder Shells
Also very useful for;
*A dip/bath for potassium cyanide, ammonia, and nitrite poisoning due to Methylene Blue’s affect on Methemoglobinemia (nitrite poisoning).
*Effective as an antidote for other forms of poisoning including damage to the liver and kidneys caused from poisoning (assuming damage is not past the point normal regeneration) due to being reduced by components of the electron transport chain (a chemical reaction between an electron donor and an electron acceptor to the transfer of H+ ions across a membrane, via a set of mediating biochemical Redox reactions
*For transfer of fish when moving or temporary storage of fish in crowded conditions.
*Treatment of new fish arrivals in a hospital tank, again due to methylene blue’s affect on Methemoglobinemia, bacteria, and protozoa.
*As a medicated bath for Dropsy or any other internal malady such as Swim Bladder problems (as MB is easily tissue absorbed). For many external infections Potassium Permanganate is sometimes a better choice for a bath.
*A test for Redox Potential in aquariums, as methylene blue will lose color in a reducing environment (you can test this with some powdered Wonder Shell
dissolved in water). See my article: THE REDOX POTENTIAL IN AQUARIUMS (& PONDS) AND HOW IT RELATES TO PROPER AQUATIC HEALTH
1 teaspoon of a 2.303% solution per 10 gallons every other day for 10 days with water changes before each treatment. BEST USED IN A HOSPITAL TANK. Methylene blue can destroy nitrifying bacteria and plants in the display aquarium.
My preferred use of Methylene Blue is a bath.
To prepare this bath I use 1 teaspoon 2.303% solution per 5 gallons (double dose) in a bath of aquarium water from the tank the fish you wish to treat came from, I usually use about a ½ gallon of water, however you may use less. Measurement of the Methylene Blue does not need to be precise as this bath should be used for about 30 minutes (although do NOT overdose). You may also add salts
to your bath to improve effectiveness for certain problems when preparing baths for freshwater fish (such as swim bladder, dropsy or unknown problems). Generally I would use 1 teaspoon of sodium chloride (regular salt) per gallon and occasionally ¼ teaspoon of Epsom Salts (Magnesium Sulfate) per gallon.
Make sure you keep the water in a warm area, as in a cold room the water temperature can drop rapidly which would stress the fish. Do NOT pour this water back into your display aquarium when finished. This can be performed twice per day. This bath is useful for fresh AND saltwater.
For more about Fish Baths, please refer to this article:
Aquarium Disease Prevention; Fish Baths
This bath is VERY effective for ammonia/nitrite poisoning, Swim Bladder problems, and is helpful for many other internal/systemic infections. MB baths are a good treatment when nothing else is working and/or little is known as to why as fish is acting abnormally (the MB bath does not always work, but it is a relatively safe method vs. indiscriminately dumping other medications into a display aquarium).
In the case of swim bladder infection or problems the MB bath is often the only treatment required other than possible correcting diet and adding more electrolytes (calcium, magnesium, etc.
to your aquarium
NOTES: Methylene Blue is removed by activated carbon filtration. It will also be absorbed by porous materials such as rock, coral and wood. Caution should be used in a display tank at full dose (not usually a problem when part of buffered chemical formulations such as Medicated Wonder Shells when used as directed).
<A href="http://ag.arizona.edu/azaqua/ista/ista6/ista6web/pdf/188.pdf" target=_blank>http://ag.arizona.edu/azaqua/ista/ista6/ista6web/pdf/188.pdf,/a.