I'm going to go ahead and assume there is a question somewhere in those spinning faces...
Snowflake, Jeweled moray and ribbon eels are about the only eels you could get away with in a 75 and honestly I wouldn't go lower than that.
If its the only fish in the tank, great but if you're planning other fish you will be limited on what you can add. Both the Snowflake and Jeweled will eat anything it can get it's mouth around and being that it's a 75 gallon tank there won't be much to choose from that will be small enough to fit in the tank and big enough that a full grown eel won't eat.
Post your stock list ideas here and we can help you out.