OK I got a couple questions... so don't everyone check out on me after getting started reading this... I had another thread,,. go no responses to my question itself.. OK here I go.. I'm thinking about adding an "ocean"... Let me see if I can explain my idea I am considering taking a piece of class about 3-1/2 inches tall and some aquarium sealer. Lay the glass in sideways the entire width of the tank (from front to back... standing the piece of glass on it's edge) glue it all in on the bottom with the seal so it won't leak and will hold water. Then take some gravel like in the bottom of a fish aquarium and slope it down (like a beach slopes into the sea) Start on the front (for example) and slope it toward the back SO in the front it would be 3-1/2 inches of gravel even with the substrate (they'd kind transfer over one area into the other without knowing it,.. substrate would be as high as gravel on other side of gravel... Anyway have about three inches where gravel run level toward back of tank,.. then start sloping downward gently until it ran out to nothing about an inch or two from the rear of the tank. That way the crabbies could get into the water if they wanted,.. play and splash around all they wanted to... Now I'm trying to decide... Obviously I don't want to go to all the hassle of having to clean and drain this little 'pond' every few days,.. and I know the water needs to stay fresh... SO I'm wondering if I do it as salt water if it'll stay "fresh" longer.... or should I do it as fresh water and just get me a set up like a fish aquerium and filter it. Obviously I am area the water will need to be filtered... checked on a deal at a pet store today. I can get a filter that'll work for not much over $10. SHould keep the water all clean and everything filtered out of it. NOW what is everyones opinion on if I should do FREASH or SALT water. and WHY. (yeah it's easy to jump in and have an opinion... lets hear you say why that opinion is a good one). I'm looking at doing what may be the best for the little critters... SECOND... I have a 10 gallon tank , and also a 30 gallon tank ... how many little hermies do you think these two can support and they all be comfortable. They can travel back and forth from one to the other.