Yesterday I went to petsmart and I got a pretty blue betta fish.. i got a 1.75 gallon bowl for it, a little plant decoration, and some marbles to put on the bottom. I got the dechlorinating thing for the tap water, put the right amount, and everything was going fine untill an hr later it died :/.
I went back to petsmart and returned the bowl.. thinking maybe it was too big for the fish or something. I asked the lady who was working there why it died and she wasn't quite sure -_- .. I then got 2 new betta fish and a tank with a divider in it. I put the dechlorinating thing again and some marbles and all of a sudden one of the fishes died :( the next day , the other one died also.. I went to petsmart and returned everything! I don't know what I did wrong :/