Jay Hemdal
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Fish Medic
My Tank Thread
Soak food in meteoplex and kanaplex. Not saying ik for a fact if it helped, but haven't lost a fish to ich before.
Neither of those drugs are indicated for treating Cryptocaryon. Metronidazole was promoted as an ich cure early on, back in the 1980's (and still shows up online) but other drugs have been found to be much more effective.
Also, oral meds used to treat external protozoan infections have a severe drawback in that the route of these medications - from the digestive track out to the skin of the fish, is a long way to go - bath treatments are always going to be more effective. Then, "soaking foods with medication" gives an unknown dose - the meds rinse off at an unknown rate, and since the original dose wasn't calculated properly, there is no way to know if the dose is appropriate!
Anyone interested in using oral meds needs to research the process and do it properly (It's a LOT of work!). I have an article on how to do that properly:
https://www.reef2reef.com/ams/proper-dosing-of-medicated-foods.780/