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I have not bred this exact species, but i have bred a bunch of other mop spawning killies, and here is my two cents. i do a 20% water change once a week in my killie tanks. The fry are really tiny, so i wouldnt gravel vac the tank when you are doing a water change, or really inspect the water closely before you dump it. When you see your first fry you will see what i mean. I usually pull the water from near the surface, then i use a turkey baster to get all the dirty spots at the bottom of the tank. Even when being careful like this i still inspect the water closely before i dump it, its nothing to wind up with half a dozen fry in the water change bucket.
My first mop spawning killie was Aphyosemion Pyrophore Komono, and for three months i thought i was doing something wrong because i wasnt getting any fry. Then one night i thought i saw something move in my water change bucket, and when i took a flashlight and looked very closely there were 3 fry in the bucket. I quit using the gravel vac, and had tons of fry in no time. I still feel sad for the countless fry that i must have dumped out back with the waste water, so hopefully you can learn from my rookie mistake.
My witness is the empty sky - Jack Kerouac