sundew care

Hello - I received these two D. magnifica several years ago when they were first released by BCP. They grew well for a while, but over the past year or two the leaves stopped completely unfurling and turn black. Lately they've stopped producing dew. Soil is a mix of peat/perlite/sand top...

I've been haveing some trouble producing few with my drosera "floating" and I can't figure out why and it's produceing new leaves all the time just hardly any dew any ideas my friends?