Did you know...... from experience, in the biz, methaline blue is used in aquarium fish fur many things. 1 is parasities, exterior like ich. But when fish are transported meth blue is used to help get oxygen to the gillsfaster, somehow. Me no scientist. It's also interesting to know that in one partic city the "best of humanity" runs the import of trop ornament fish? Yeeeeeahhhhhhh....... also lotsa fish farms ornamental fish, in Levant. Yeeeeep. Koi, goldfish. Etc. Yeeep