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What to seal the joint between the acrylic bathtub and tile?

I need to seal the seam between the acrylic bathtub and tile, is now silicone sealant, but went black fungus, I want to remove and the seam put either epoxy grout (as an option can fill the epoxy resin, just so the water did not flow there), or choose a sanitary sealant. What do you advise?

• bathroom
• tile