The water level in the aquarium could be 10 15 cm. You also needs to add some floating plants with small leaves duckweed, pistia and small shelters for the feminine. It is not recommended to put the soil on the bottom: it may be challenging for a male siamese combating fish to pick up eggs that have fallen from the nest. Aeration is also needless, the jet of air bubbles can destroy the nest. Up to 200 eggs can be laid during one spawning, but typically, no greater than 1/3 live on. When the female of the siamese combating fish is able for spawning, she swims up to the nest, the male wraps round her and helps to squeeze out the eggs while fertilizing them with milk.