Fish profiles refer to calcium carbonate as ppm and deg German as dH. Just different words for the same thing. You have very hard water, I'm afraid, so most of the fish named in post #1 are not suitable.
This leaves you with 2 options.
#1 Change the fish you would like to keep to those suited to hard water.
#2 Change the water to suit the fish you want.
#2 is not very difficult. You need a supply of reverse osmosis water and a GH tester - there are many brands on the market. Fish stores sell RO water as do those stores catering for window cleaners - our window cleaner uses it. Or you can buy equipment to make it yourself, though as the process wastes water it can be expensive if you are on a meter.
Tap water and RO water are mixed to get the hardness (GH) to the level needed by the fish - this is why you need a GH tester so you know what proportions of tap and RO get the level to what you want. This is done before the water is put in the tank so the level in the tank remains constant. It also means you need some RO water on hand at all times in case an emergency water change is needed. It also means fishless cycling is a good idea as fish-in cycling involves a lot of water changes. The "useful links" box on the right contains a link to the various methods of cycling a tank.
We have members who live with hard water and prefer soft water fish so use RO water. One of them has made this comment on the forum
Fish stores are notoriously unreliable when it comes to advice. Most workers have little knowledge and are trained merely in how to make a sale. Always do your own research and never ask them for advice.
Seriously Fish is one of the most reliable out there. Many other sites give misleading or inaccurate info. Seriously Fish tells us the tank size a fish species needs; the hardness, pH and temperature it needs; whether it needs to be just a single fish, a pair or a group and so on. Always check on whether a fish is suitable for a tank before buying.
www.seriouslyfish.com
Hello
welcome aboard matey, I too have very hard water and I keep rainbow fish.
Whether you choose to go RO or keep fish suited to your local water (which I recommend, especially as a beginner) we're a good bunch here and will help you step by step
Hi. I have no idea what to do. I am a tad overwhelmed with all your advise. And maybe a little bit gutted. I don't really understand about Ro water stuff. I just wanted a great tank. Obviously my dream is still to have the tank I want. But need more info these things and what to buy etc