Kordon Methylene Blue Disease Preventative – Safe for Freshwater & Saltwater Aquariums, Prevents Fungal Infections & Treats Parasites, Reduces Fish Stress, 4-Ounces

I’ll include two links: first is less expensive but second is double the product. https://a.co/d/0cCPDlnr https://a.co/d/0aNab1F2

Forgot to mention I ordered the methylene blue off Amazon but it's hard to find on there sometimes. Good luck! Keep us posted. https://a.co/d/0chyPwlL

How about these links (1st one less pricey, 2nd one has double the product) https://a.co/d/0gS5XqNW https://a.co/d/0cWkBhD9