If your male betta fish has a lot of bubbles in his tank and is constantly facing the female betta, even though they are separated, he is likely trying to build a bubble nest. Male bettas construct bubble nests as a place for the female to lay her eggs.
To help your betta build a nest:
- Provide leaves or other plants for anchoring the bubbles.
- Ensure good water quality by testing regularly and making changes as necessary.
- Keep the tank temperature at 78–82 °F.
If your betta does not build a bubble nest after providing proper materials and environment, consult a veterinarian or aquarium specialist to determine the cause.