From an old man, who hasn't been caring for fish since the "dark ages". I stopped my aquariums after the children were born. The family, career, and house took first place in life.
When I stopped, 35 years ago they were just starting to use UGF and were talking about the nitrogen cycles. The big problem was no internet, no information, just what you found out from people at the LFS. Books, not much infor there either.
Any way the addition of CO2 to the aquarium is new to me, and I would like to know what you do, in general. Do you watch CO2 levels, have an indicator, or add CO2. I'm not sure if I just need to let it do its own thing.
I have purchased a 125 gallon, that had fish, discus, and angelfish. There was a RO system, and 75 gallon holding water tank included.
I have had it up and running since January . Lots of new technology, and theories out there now. A whole new world of fish keeping. If I had been reading this web site before I set up this aquraium, things would have been done a lot different.
The best thing is all the knowledge that is now at our finger tips.