Hi, our toilet was running so we replaced the flapper. This helped but now every few hours it will run again. We put some food coloring in the bowl & it's definitely leaking at the flapper. I've cleaned the rim underneath & adjusted the chain a few times. Any other suggestions? Maybe we should keep adjusting the chain a little (there are a few holes on the arm). I also read somewhere that you can put something like a quarter on the flapper to help weigh it down. Not sure if this is a good long term solution. The new flapper looks exactly like the old one so I don't think we bought the wrong kind.

Thank you in advance for any help!