Thank you for your answer! I know that the silver dollar is a tropical fish but it seems to be doing just fine in this tank.The temp is about 74 and the frog is very happy and healthy. What would you do in the summer when it is hot outside and the tank water is hotter than normal due to the outside temp? We used to put a fan on it to help keep it a lower temp.

What I am wondering is if you might know how long it takes for silver dollars to grow? Since they are in the 10 gallon tank will it take longer for them to grow?