Update of Northern platyfish husbandry manual

The husbandry manual produced by our project has been updated. New additions: more details about the disease control and optimal temperature + few more husbandry examples with photos from our members.

The current version of the manual can be dowloaded here: http://xiphophorus.info/files/XNP_husbandry_manual.pdf

Thanks to all contributing members of the XNP project for sharing their experience!