Gestation Length
Average 28 days at 78°F. Warmer water (82°F) shortens to 22-25 days. Cooler water (74°F) extends to 34+ days.
First-time mothers sometimes run long (up to 35 days). Experienced females are more predictable.
Visual Milestones
Days 1-10: gravid spot faint gray, belly smooth.
Days 10-20: spot darkens, belly begins rounding.
Days 20-25: spot dark black, belly square.
Days 25-28: belly very full, eyes visible through gravid spot, female hides.
Behavioral Signs
48 hours before birth: refusal to eat, active hiding in plants or corners.
During labor: female "twitches" or quivers periodically. Stays in one spot.
Setup Timing
Move female to birthing tank 3-5 days before expected due date. Too early stresses her; too late risks delivery in main tank (fry eaten).