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The strength and continuousness (is that a word?) of the lateral band, the strong red margin on the dorsal even in a young male, and the lace-like pattern in the upper caudal all suggest A. gephyra to me. Companion species seem right, too.
Looks like Gephys to me, too.
See: http://www.aquarium.ch/forum/showthread.php?t=39087&page=2 - you have to scroll down about half way on the page (the one under the A. hongsloi), and there is a photo of an almost identical fish to yours, which is most likely gephyra.