OK I'm in the process of building my rack. My new snakes are all in quarantine in CB-70s, I had been using peg board, weighted down for tops but have had two escapes (luckily I caught one in the act and the other one went about six inches and hid inside a guitar, he's been officially named Fender). So I'm now stuck with having to put the lids on the CB-70s to prevet escapes. Now they aren't very "air tight" but I don't want to have any accidents. I've drilled 1/4" holes about every 3 inches or so and some in the lid (6 down each of the long sides, 3 on each of the short sides and 20 in the lid) is this enough ventilation or should I drill more. I also expected to use these in the rack so I didn't want to over drill either. Any suggestions. Thanks!
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Tosha 
3.7.0 Ball Python (Harry and Fluffy and currently un-named)
0.1.0 Siberian Husky (Kita)
0.2.0 Feline (Pippen and Pandora)
0.0.1 Dessert Tortoise (Pope)
7.9.5 Fish (1,2,3,4...)
0.0.1 Frog rescued from pool skimmer
0.0.2 Lizards rescued from pool skimmer



