I added 24 neons to my planted 40 breeder on Sunday. The tank has cycled for 6 weeks with a Sunsun (Polar) 304b filled with pot scrubbers. I've lost 4 fish in 5 days and don't fully understand what is happening. My water is good - ammonia 0, nitrites 0, nitrates <50, PH 6.0-6.5 with CO2 injected for 8hrs. I'm running a Finnex 24/7 planted light for 8hrs offset by 1 hour after the CO2. There's been some aggression by one female (I think) but that seems to have settled down the last couple days. Can anyone offer some insight or experience to help explain what's happening?