Brachygobius sp. Breeding
I have 4 of these fish in a 5-gallon tank. I turned around the other day and one of the males was bright yellow and attempting to get a female to come into his cave:
I took a look in the cave last night and it seems he was successful as he is definitely now guarding a batch of eggs:
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I haven't attempted to raise fry yet, but these guys are still at it.