each compartment is its own independent water source. It wont be hard to do the water changes since I am using a sirenge. I know that about 60ml of water is in it, so I will just pull out 40ml and add 40ml back. the $ of spring water may build up, but in the mean time I will make do. how often do yall think I should change the water? I was thinking every 2 days.. but may be excessive.
I havent started thinking about the froglet stage yet... not real sure what to do at that time. I do have a 2nd one of these though. I got this one at the Container Store and they also have 12 compartment ones that are 5" long with the same other dimensions (WxH), so I will just make a slope within there somehow.
At the rate these Vents are dropping eggs I will need 6 of these soon

not that I am complaining!