I would say depends on the size. Bear in mind I have not kept a snowflake, but I have had golden dwarf morays. The first one I had, got out of a tank where there were similar gaps but even smaller. But that is a much smaller moray than a snowflake (unless it's a baby snowflake that is).
Think the issue is that they can push their way out too if they were curious enough. So I think what I would do, if this were my tank, is take some black electrical tape and tape along the edges of the back panel there so that it can't be bumped out of place easily. Then, maybe some filter batting jammed into the larger gaps (ie. around the skimmer pipe) might be the way to go to really make sure it's escape proof.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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