Join Date: Jun 2014
Location: Los Angeles, CA
I frequently had massive die offs at about the 8-12 day mark. These stopped when I started keeping the cycled sponge filter in the tank and running through the entire courting, breeding, and raising process. Water quality (even with a change) is your most likely smoking gun.
2nd most likely from a fast die-off is velvet.
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Golden State Bettas president, and proud IBC member!