I knew it was a long-shot, but I appreciate the guess. To my eye it looks like the quintessential Acro and nothing really sticks out as an identifier. It would possibly help if it were at least a mini-colony so a definitive growth pattern could be observed.
Dana Riddle had published an article where numerous blue-green fluorescent pigments were examined. The low-light clade which expresses well at 80 PAR, cyan fluorescent pigment 483, is known in A. pulchra, but it could also be in many other Acros as well.[h=3][/h]