I have a new tank. It is a 40 gallon paludarium with 20 gallons of water. I have 8 female betta's, 6 ghost shrimp, and 6 bronz Cory cats. I have 4 fiddler crabs but they like to stay out of the water. How many more betta's can I add? It is live planted. I do not have a picture of it but it is heavily live planted with Amazon sword, coconut hides, water weed, hornwort, and floaters.