my only pointers for you right now, becuase youre keeping pairs of standingi is, keep large plants that can support there body weight, sanseveria, and large leafed bromeliads, and iron rod plants work well. standigi seem to bee happier on plants as opposed to bamboo unless their basking. Also with bamboo ( this is the prefered wood for species of Phelsuma) make sure it is large enough so that the standingi can high in it, lay eggs in it, and just be in it. If it is to large the geckos wont like it becuase they feel its not safe and they can hide elsewhere, if its to small they just wont fit... keep a medium humidity, give a light misting in the morning and at night, dont do any type of heavy misting all that does is makes the geckos uncomfortable, in the wild the geckos can escape the rain, but in a captive enclosure the geckos will get stressed if you bombard them with mist. They dont like it at all, all they seem to know is eat, sleep breed hide bask or get cool. When you mist them they dont get happy like someone in a shower they want to hide and then get warm. A good way to keep the gecko hydrated is just feed hydrated crickets. Multiple poeple i know have kept all species of Phelsuma with bare.y any levels of humdity and just fed healthy gutloaded crickets, and the geckos have no shedding problems and they breed well and are healthy. Also Phelsuma will happily drink water from a bottle cap, if their thirsty they dont mind drinking standing water. Make sure to fluctuate temperatures in the tank. Have a couple good basking areas, have warm areas, and have cool areas. This will make your geckos happier so they can relax wherever and the females wont have to stress as much to find an egg laying location. As far as egg laying locations go, have good sites for laying in each region of temperature, for cooler areas sanseveria offer good spots bcuase the pockets where the folds meet, in a medium heat region bromeliads planted in the background along with bamboo offer good sites for laying. bromeliads also have good pockets for laying as well as bamboo does, if the bamboo is a proper size for your geckos, the geckos will feel comfortable in the bamboo and will be able to lay there. In a high region the only usual spot you need for laying is bamboo, most of the time a Phelsuma wont lay though under a basking light i have only had that happen a few times, a good way to set up a spot under a basking light is make a little hole in a piece of bamboo so that the standingi can get in, next to the entrance cut out a large piece and put very tiny hignes on the piece, so it acts like a doorway, when the geckos lay you can open the piece like a door and snag the eggs. There is much more i can tell you but youll just learn with expierence, if you have questions just ask around the forums, everyone will be happy to asnwer your questions!
