flyrisk of lawnmower blenny?

Recommend at least an eggcrate tank cover. Ours jumped to his doom a couple months ago.
 
Guess I might as well go ahead and put the eggcrate on. I knew I'd have to do it eventually anyway.
 
I have had one for a few months -- stays around the rocks and nibbles on the the glass too -- seldom if ever ventures near the top.
 
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