Your tank probably isnt done cycling. Well, I think it may be fine, its a 50/50 chance. I think snowflake eels are hardy. When my friend first got into the hobby, he added a snowflake eel, like only after two days that his tank was set up, he didnt know you have to cycle, and the poor guy was pulsing and throbbing, but he is still alive and well to this day(3 months later).