I just recently got two pairs of GBR's. They are already showing signs of spawning already. One pair is cleaning off a rock, chasing away the panda corys, and the female has a "tube" showing behind the anal fin. What throws me off is that they are just juveniles, about 1.5 inches long, I'm guessing about 2.5-3 months old. Does this seem like spawning behavior to you? I've had these guys years back but i never had them breed this early. Try to get pictures tomorrow.