I have just recently bought one of these, however I think I may have bought the wrong size. My question is, are these supposed to affix to the top of the viv or just sit on the top? I have an exo terra viv as well. Iv read the instructions and all they say is how to fit the bulbs.

Just in case you anyone is unsure of what im talking about:
Exo Terra - Products: Compact Top

Cheers guys.

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0.1.0 Brazilian Rainbow Boa- Angie
0.1.0 Bearded Dragon- Roxy
0.1.0 Amazing Girlfriend- Sarah
My three girls

I think they just sit on top of the mesh

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3 Tokay Geckos SNIP/SNAP/GNASHER
1 Blue Tongue OZZY
1 Uromastyx BRUCE
3 Oscillated Skinks
12 assorted dogs = 1 GSD,1 Rottweiler,2 Cavaliers,2 Lurchers,1 Yorkie X, 1 Sprollie, 1 Staffie X, 1 Min Poodle, 2 Mongrels
14 assorted cats = 1 Persian, 1 Mainecoon, 2 Devon Rex, 1 Oriental, 9 Moggies(inc 4 semi ferals)
1 African Pygmy Hedgehog(Elvis)
3 kids DAN SOPHIE-LEA CHRIS
1 OH STEVE

Mitch my special GSD Gone too soon 22/5/08 We miss you so much

In Fondest memory of Ginny my beautiful old GSD who went peacefully to sleep 8/5/08

RIP Herbie my Blue Persian
RIP Mog my Black/White boy
RIP Izzywizzy my feral girl