Hello all

My names lin and I am extremely new to this. We have brought a 400 litre tank which I would dearly love to keep discus fish in. We know nothing at all about it but welcome the challenge. The only problem is we keep being told conflicting advice about them. Even down to what water they like ..... 1 said softened water then another said R O water then another said they have them in tap water!!. So now we are totally confused . The tank has been up and running for 1 week so far, which was filled with tap water......and that’s as far as we’ve got. Any advice would be appreciated.

Thanks
Lin