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A one year fert stick may not have lasted one year. I put root tabs under my crypts once a months or so and they tabs are gone before I replace them even though the root tabs are supposed to last 3 months. Anubias really like to have their roots imbedded in the gravel so you are doing well. Many say that the roots are unimportant but I have found that my Nana mopes for about 3 weeks if I trim the roots and when they get back into the substrate the leaves come out stronger than ever. I would say try another whole or maybe a partial fert stick or try dosing some NO3. The other plants might be using it up before the Anubias is getting what it needs.