Sorry for your loss. It looks like a pretty cool fish.
At the risk of sounding insensitive... the first link that pops up in a google search says "The Lizard Blenny is a great jumper, making a tight fitting canopy a must."
http://www.liveaquaria.com/product/p...41&pcatid=2141
for the record, I recommend canopies/lids for any tank that houses anything that is capable of clearing a tank without... and most fish are.
edit: I just looked at the pictures you linked in your sig and I see your tank does have a canopy. How high does it reach above the water line?