Facts I've learned about Silver Dollars
150G is perfect for a school of Dollars
They are fish shaped lawnmowers
They are the most neurotic fish you will ever meet
They do better in groups of around 6
I believe you can sex them from the colour of their bottom fin
They are good with most other fish
When they fight it's hilarious as it's like a whirlwind of silver
Make sure you have a roof as they will jump
Try to avoid anything with sharp/rough edges, as the dollars as so neurotic if startled they try to push themselves into the small gap they can. This often leads to scaring.
I've got a school of 6 dollars and they're fantastic