In my 64-liter tank, I have 6 neon tetras and 2 pairs of Apistogramma atahualpa F1. It’s been 4 days, and I haven’t seen the female at all. The male seems to be getting used to the tank—he comes out to eat when I feed them but hides again afterward. However, the female doesn’t come out at all, neither to eat nor to explore. What could be the reason?