I just started my first C02 tank. The water has been in the tank for around a month and i just turned the C02 on 6 days ago. Well yesterday was the first day i tried to put some fish in there and about a minute after doing so all 6 angels were belly up I hurried up and put them back in there non c02 tank and they were fine again. So then today I put two angels in a 5-gallon bucket and put ¾ non-c02 tank water and ¼ c02 water and then after an hr I did ½ c02 and half non-c02 then after another hr I did ¾ c02 and ¼ tank water then I final put them back in the co2 tank and they started to do the same thing just not as bad they are just at the top sucking air. So my question is how can I get them acclimated to the c02 tank. It’s a 90-gallon aquarium. Thanks for any help.