[SpeedEuphoria]

That is strange, it must be the weakest one obviously. I dont know, but I tried 2 Angels from a bad source and the acted the same, but I do not have another tank for them so they died.

Maybe you can turn off your CO2 and do a WC before moving it to the main tank,then let it acclimatize to the CO2.

I think this must be it, just b/c water has good oxygen, the fish still is not used to the co2 levels(they coexist at independent rates).

 

[SpeedEuphoria]

That is exactly what I did. Changed about 70% of water, then moved the fish. So the CO2 was low when transferred.

But did you do it durring the day when the CO2 was still on? So it would build back up pretty fast.

I just got into this pressurized CO2 thing, so have been wondering how people acclimate new fish to this or if it cause any issues.

People tend to say raise the CO2 levels slowly and watch the fish, well once you get those fish used to higher levels, then you would think it may be stressful to new fish.