Ah so the Vaseline and tape aren't looking so good. The tape is tempting and would seem plausible if it's done
**very** carefully leaving absolutely no sticky-side facing up and no air bubbles so that it would never come undone. Checking the tape on a routine basis would be required as well. It also eliminates the problem of the mantids dragging Vaseline throughout the enclosure.Can't really stop them from climbing up. Well, you are probably correct and really, the solution is easy. Get the lights off of the top of the enclosure.
So to recap:
1. Mantids hanging on the roof - Impossible to stop, no solution, they MUST be allowed to dangle from the screen regardless of plant life available and no matter how precisely/carefully placed the tape is, they will get stuck in it. Vaseline could be toxic, will get dragged around the enclosure and could interfere with molting.
Solution - Raise the lights off of the top of the enclosure and let them dingleberry up there.
2. Money - It's unnecessary, you can save a lot of money, it's not as portable and the Exo-Terra 12x12x12 is not really a good idea for Mantids
Solution -
I'm okay with the money and the enclosures can be split into 2 smaller enclosures and only the biggest of my collection go in here, the rest will be placed on the right-hand side of the cabinet.
3. Cabinet might not have enough air flow
Solution - Install computer fans and route them to a power source (AC Adap or PC PS)
Okay so with all the warnings and "dont do it" advice. I'm not going to buy the 6 Exo-Terra enclosures. I'm going to buy just 1 enclosure and see how well it works (or does not). That will reduce the cost of this thing *significantly* and is just.. a smart idea since I don't really know how well they will work. (or not).
Cost:
Cabinet - Estimated $100-$125
(1) Exo Terra 12x12x12 $45
(1) Exo Terra Compact Light fixture $15
(1) LCD Thermometer $5
$165-$190. That's a very rough estimate and it doesn't include anything that goes into the enclosure.