Hello. My DH wants to have a fish in his study. We are going to start simple with a large glass bowl. I have a few questions; 1) is tap water with the water safe stuff ok, some websites say to use bottle water only 2) We have a cat, will it try and get the fish, if so any ideas on covers 3) suggestions on an easy starter fish and lastly 4) do fish need company ie shall we get one or two?
Thank you