Thank you Kathy and Martin. So the male is just learning how to care their eggs. Then, I will be patient for the mean time. As Martin said my sexing the pair was "based on the abdomen plumpness". The abdomen of the female deflated when I found the male's mouth was half open to carry the eggs.
Jens, according to "Basslets, Dottybacks & Hawkfishes" by S.W.Michael, "The eggs hatch in 7 to 9 days at a temperature of 25 to 26C."
Bandeng
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