hey guys i have a fern(dont know the species)that is not doing so well and need some advice on what to do.well the fern grows new leaf stems all the time but the fern is not getting ant bigger becasue some of them grow out and look healthy but at a certain point the whole stem starts to die off.here are some pics.tank temp is 70F-75F,humidity 65-75%,10 hours of light per day




any advice?

thanks guys