Will silver dollar fish get along with guppies?

Answer 1

Silver Dollars grow to over 12 inches long and could well eat a guppy although they are normally vegetarians. You need a minimum size tank of 30 gallons to keep a couple of silver dollars. Please follow the basic rules. :- 1 inch of fish needs a minimum of 1 gallon of water. :- Every tank needs a permanently running cycled filter. :- Every tank needs at least 50% of its water changed every week. Keep the above rules and your fish stand a chance. Fail in any of them and I can guarantee that you will have constant health problems with your fish.

Answer 2

Silver dollars CAN be a little territorial so expect a few squabbles, but they're schooling fish so fights should not be common. How many do you have, and what size is the tank? Generally, they should be kept in schools of at least 5 members, and they need lots of room to swim. So if you're keeping a bunch of them in a small 10 gallon tank, that's a no-no. Likewise if you only have 1 or 2 of them, that's bad as well. I dunno why but schooling fish tend to turn aggressive when there aren't enough of them to kick off their schooling instinct.