OK, my knight goby spawned last night, and I think it has got to do with their diet. I fed my knight gobies spirulina once a week a few weeks ago for a few weeks (that's some tongue twister), and that's when the female's belly swollen up with eggs, and they started their spawning fiesta. I stopped feeding them spirulina a few weeks ago, and they stopped spawning, but the female's belly seemed to continue to be swollen with eggs. I fed them spirulina last Tuesday, and they spawned last night ... could spirulina be the key to spawning?