@Balgay.Hill Yup, I definitely checked the soil before I water them. I just tried @BobTheGardener suggestion to get rid of the aphids first by wiping the leaves on top and underneath. Will check for few days. I also removed the one that has turned yellow. Will try all the suggestions here to repot etc as well. Thank you everyone, this is a great community!
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Stick a finger in the soil an inch or two, and don't water unless it feels dry.