Ok I just started fish keeping yesterday. I went to petco yesterday and got a 10gallon tank. The guy recommended 4 goldfish. So I filled the tank with water and I added water dechlorinator I added 4 goldfish. I think they are a fancy tail gold fish.they are really fat and cute Ps. I added a filter too, but I don't think that's needed, but I'll keep it running instead. The fish store owner gave me a bottle of bacteria (called Tertra safe start) and I poured it all in the tank. Please give me some feedback on begineers fish keeping. Here's my tank if you're wondering.