Have you check the plants requirement?
It might be lack of certain nutrients too. As you purchase from lfs, most of the potted plants are wrap in rock or mineral wool which contain some nutrient on its own. When you remove the wool, the plants will directly depends on you for the required nutrients. If you did not remove the wool, they will leech on the nutrients in the wool for about 2 to 3 weeks ( Depends on plants ) it will start to melt off slowly and in some case the roots will also root if you did not remove the wool.
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