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I think it's dying, but as you can see there are a few bright green leaves growing. So I don't know for sure what to do????

defo looks to be on its way out.

any ideas why?

I'm not an expert, by any means, I'm closer to a rank amateur, but I'd venture that your anacharis does not have enough nutrients.

Do you use any fertiliser?

What lights do you have?

If I remember correctly, Anachris are seasonal plants that die off in the winter, so that may be what you're seeing; also, I believe they are cold-water plants, not tropical, so the really don't do well in heated aquaria.

What its your lighting and ferts?? Its still salvageable but not for long