I have kept a male and female calvus for about 2 years. Up until about 2 months ago, anytime the female got near the male he would chase her away.
Recently, (and more often a day after a water change), the female will get very dark and travel to the male's side of the tank. He will follow her under a piece of drift wood where they will hover very close to eachother. She is under him with her dorsal fin touching underneath his jaw. They stay like this for a few min. then the male darts back to his cave on the other side of the tank.
After he goes back, everything goes back to normal and they stay seperated until the next water change.
Is this the start of spawning behavior?
THanks for any advice!