Zsolt
I was told that it is volume 2 of the dwarf cichlid series -- not just an extension. The book is supposed to include new info and species/populations since Römer turned in the manuscript for volume 1. Römer recently submitted the manuscript for this second volume. Of course the first edition will be in German. Who knows when/if for English.
I was given permission to post the (tentative) cover photo for this new volume. Currently it can be found on this page, under my March 12 entry:
http://characin.com/carey/journal/
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