Ghost (white) ribbon eels are easy to keep. Personally wouldn't attempt black or blue ones again, success rate on those I believe to be near zero long term. I don't believe a cover is required if you have a decent size euro brace. If not you could construct something to do the same purpose without completely covering the top of the tank if you're appose to that. The overflow will require pretty good netting, typically two layers of gutter guard type mesh is good choice.
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