you want 12x12 for adult male Cranwelli, so yours 16x11 would do, but for bigger females and males you gotta go with 18x18. you need to put somewhere a water dish, it will take space. don't know about tomatos, but i think they needs bigger space.

temps at 88 is way too hot for them. you want to keep at 76-78 night and 80-82 day.