John,
Nice pic!
I used to care for a trio of yellowbacks (1.2) and the females would wrestle like crazy whenever the male citronella in the neighboring tank would call. It's amazing just how attuned they are to the frequency as I couldn't even hear him call, but knew he was whenever I saw them fighting. Oddly enough, the male yellowback didn't care much for calling and just loved to eat....lol. He did his part though... if he felt like it.
Justin