I would keep it in larger tank. As a fish that can grow more than two feet, it deserves at least a six foot to really move. But, according to many on this site, I understock my tanks! As for brackish, I believe it is salt. Some fish can survive in not-ideal conditions for a while, but this is a saltwater fish (if it is the saltwater snowlake eel... there is also a freshwater eel that is called snowflake, I think). If they're keeping it brackish, you'd need to slowly add salt in order to increase it to salt (1.025). If they're keeping it brackish, and it is fresh, you'd need to determine that, and move it down, slowly, to freshwater levels. Is the problem with common names! But I'd keep it in a larger tank. My snowflake (salt) is in a 75, about to upgrade to a 180, as soon as I get it moved in the house, but he has grown only an inch in two months, if he's grown at all. I feed him well, a variety foods from a turkey baster, but he doesn't grow that fast. So I think you have some time, if the specimen is small and is the saltwater snowflake eel.
