![]() Acquiring some myself five years ago, I’ve begun incorporating it into my arsenal of aquarium fish disease treatments. Thinking back to when I was a youngster, I did some research and discovered that the active ingredient in Marex was chloroquine, and I was familiar with that drug as it was being used by other public aquariums. Still, it seemed to be the best method for quarantining or treating active diseases in fish. Copper is slow to affect a cure, and the difference between a therapeutic dose and a dose harmful to some fish species is slight. For the past 25 years, I’ve been using ionic copper measured with a spectrophotometer twice a day to control marine ich and other protozoan diseases. Marex was sort of a wonder drug for us back then – simply adding a single $1.99 dose protected the fish in a 50 gallon aquarium from many diseases plus it killed the unsightly algae that grew all over the tank decorations back in those days! When the company went out of business I moved on to using other products. ![]() The reason was a product called Marex from the Aquatronics Corporation (they have long ceased operations). In early the 1970’s, when I was just 13 or so, Cryptocaryon irritans (“marine ich”) and Amyloodinium ocellatum (“marine velvet”) were a bit less of a problem for my fish than they are now when I quarantine new fish as an aquarium curator.
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