My female of my established pair of GBRs has changed moods drastically. Use to follow the male around and chase other fish, now just sits still at the bottom of my tank and hardly moves. She won't take food, either. Frozen brine, bloodworms, freeze dried bloodworms, flakes, algae pellets, etc. She also hides for hours at a time. Not sure how they behave before spawning, but her belly is pink and looks a bit larger than normal. Could this just be a sign of her getting ready to lay eggs, or is this something else? Thanks I. advance!