Bob, But surely the "tube" only appears when they are about to spawn. Therefore if you only have the one sex this will not happen. Helen >The dorsal should be slightly more pointed at the back on all three. Other >than that, you have to feed mature specimens heavily and look at the tube >that sticks out the bottom > >Bob Dixon ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!