HCA: Hermit Crab Association

Thank you all for your great advice. I too had found using 2 ponds, 1 fresh water, 1 salt work fantastic. When doing some research online I found a wonderful Crabitat photo where they used small plastic paint trays lined with stones for the crabs to crawl in and out of their pond. I use a double air...

My husband and I are planning to go on vacation in May and I was wondering if anyone knows or has any ideas or experience regarding automatic watering for fresh and salt water?