for i should have learned from one of my rainbows doing the same thing in the sametank, 4 months ago, but unfortunately i can be a lil absent minded. i gave the cobras the benifit of the doubt that tiny gap but oh no, the mid sized on managed to get out a gap that was so small it shaved half his scales off! and yet again i was out and returned to find a dryed up sh on the floor 3 meters from the tank. gapsnow perminantly plugged with plastic to stop any future attempted escapes! but i just cant beleave the stupidity off my self on this one! 
