awesome setup, and beautiful mantis! i had a wennerae before in a cube with 2 pcs. he wasnt as active as i thought he would be. as for the LED's, +1 on DIY. soldering is super fun and you can make a fixture for that tank thats much brighter than what you have now for most likely under $100 in parts. i think rapidled has a DIY kit, id look into that if i were you, maybe not even put optics on it since you dont want him to get concentrated light in case of shell rot (and itd still be brighter than what you have now... not to mention the bulbs last 10-15 years!) you can light a 75 fish only tank with 6 3w LEDs without optics. at most double that on your tank at around $3-$4 a bulb and you should definitely have enough PAR for your zoas.