This is my crabitat thus far, the relative humidity is at a constant 80% by using a tropic aire humidifier and air exchanger. The temperature is a constant 75 degreess F. by using an under the tank heater (UTH) I also use a 15w exo terra moonglow bulb at night which raises the temp to 77 degrees F. I run the light on a timer and only stays on a couple of hours at night. I use a high quality cigar thermohygrometer to accurately read the temp/humidity in the crabitat. I am currently using beach sand in the crabitat and in one corner I am using calcisand. I plan on adding another level in the crabitat by using an aquarium landing and will outfit each landing with moss and coconut fiber. I also plan on adding two bubbler bowls, one for each freshwater and saltwater. I know it is hard to see anything in there but there actually is a large cave in the far right corner complimented by hanging plants. There is also a large fresh and saltwater pool in the back left corner. In the dish that is showing in one of the photos is not dirty water but fresh coconut juice and flesh! I have three crabs in there all hiding right now and my 4th crab is molting in an isolation tank (iso) My crabs enjoy the crabitat, what do you all think?