I got a Betta 16 months ago. He has always been extremely friendly and active. I keep him in a 2 gallon bowl with things to hide in and a large plastic plant. About 6 weeks ago I replaced his plastic plant with a live plant upon approval of a pet store employee thinking it would make my betta happier. The second cleaning, after placing the live plant, the water had an odor. The next time the smell was even stronger so I removed the plant and put the plastic one back. At this point, my Betta started to become less sociable and I noticed a dramatic change in his food intake and he wasn't blowing bubbles at the top of the water which I've read is a healthy sign. Upon the next water change, the water was still smelling. So this time I replaced all the rocks and washed everything in very hot water. In the last 2 weeks, my betta has only eaten 2 pieces of Betta Bits. He lies at the bottom of the tank. He no longer greets me. He only comes up for air. I asked 2 separate PetSmart employees if I could do anything and they both said he is probably dying and there is nothing I can do. Can anyone offer ....anything? Would putting a live plant in there have made him sick? Is there anything I can put in the bowl to help him get better? (I do use Bowl Buddies with each water change). I see no physical changes other than perhaps his belly being a little more white than normal but hard to say for certain. Any help would be greatly appreciated. He is my first fish and I really enjoy the little guy. Thank you!