justintoxicated said:
Soft water usualy also results in lower PH. So does injecting Co2 reduce water hardness or not really?
Not exactly... Ever tested the pH of RO water? Should be 7.0 - Neutral.
Soft water though, by definition lacks buffers to prevent pH drops. No buffers, plus CO2 injection = pH drops. But teh CO2 will not alter the hardness (GH).
My water will test 0gpg on a liquid test kit, I have to use an electronic TDS meter to find out what it is. It runs about 7 to 11 ppm. Since I don't want to worry about pH crashes, I use crushed coral in my filter, in all my tanks. It keeps me steady between 7.0 and 7.2 on the pH. When I do a water change, the new water is at 7.0 so adding 20% even if the tank is at 7.2 makes very little difference.
In the days of wild caught fish being the norm, it was far more important to try to duplicate the natural environment as closely as possible. Any more, it's rarely necessary. Keep things stable and you will be fine.
The snails like hard water because they need the calcium for shell building. Most of what you are seeing in a hardness test is calcium, or calcium based compounds.
Possible stocking issue: Popondetta_furcata are recommended to be kept in groups of 6 or more, and require medium hard alkaline water. But they are really cool-looking fish! Rather than Rams, I think I would go for some more of these guys... (I looked them up - this is not personal experience)
Rams can get territorial, especially when breeding.
If you look around, you can find information that says anything from hard alkaline to soft acidic on the water conditions.
They also have a reputation for not being very hardy and having short life spans.
Actually, I think the Rams wouldn't do that well in this tank, with the stocking you have now. YMMV