My husband and I have African Dwarf Frogs in a freshwater tank. We saw a picture of an underwater dry zone for fiddler crabs and fell in love with it and talked to someone at the pet store about it. We've been ordering the perfect parts we need for weeks and finally got it out togetherast night only to find that Fiddler Crabs are supposed to be in brackish water! We are so disappointed because we were so excited! Is there any way to have fiddlers and ADFs together? (Or Fiddlers and freshwater fish in general...) I'm thinking putting just enough salt in the water so it's somewhere in between brackish and fresh?