Sorry I had to go for a Second so I couldn't go into detail with my first post.
First of all I have a guppy in a 16 gallon tank along with a few tank mates nd I am working on getting more guppies soon ( I'm getting some this weekend) when I did have a group of guppies their was a significant difference in his behavior, when he was in a group he was much more active. Ao I would recommend that you have upwards of 3 guppies and if you do choose to get males along with females the recommended ratio is 1 male to every 2 females, but I think that you should get all males, because if you get all females or males and females, you might have lots of problems with the fry. I remember when I went on a trip to Petco the person that was working their said that the females were often preganat even though they separated them because in the fish farms they didn't bother to seperate them. If I were you I would get a minimum of a 10 gallon, foot long tank because guppies are really active fish And IMO they deserve that much space and nothing less. I would never ace a guppy in anything smaller. Yes you would need a filter if you were planning to have more than 2 guppies. But make sure that you cycle your tank before you get the fish. Guppies are not good in a tank that is being cycled IME. These fish also would greatly appreciate planted tank but is not needed. And these fish DO NOT need a heater because they will live longer and will be less likely to get diseases in an unheated tank, as long as you can provide the water temperature at a minimum of 72 you should be fine...... Well you would need a heater if you can't provide the recommended temperature of 74 degrees Fahrenheit
Last edited by fishy friend2; 01-20-2012 at 05:46 PM.