Balloons&killies
Fishaholic
So nmonks are they frshwater?Google Gasterosteus aculeatus. Females are metallic green, as are males outside of breeding. During the breeding season (in my experience, from January to June, when kept indoors) the males acquire red bellies and bright blue eyes. They're extremely attractive fish, and a revelation to anyone who things colourful fish only come from the tropics.
Cheers, Neale
Could you put a pic of a stickleback???