I have read alot of posts about this subject and it seems like numerous factors could cause browning. Im a little confused about what issue may apply to my situation. I want to get it taken care of before any irreversible damage occurs.
About a month ago I purchased a robellini from Home Depot. My "soil" in my yard is almost 100% sand so I purchased a miracle grow soil for in ground plants and mixed in about 40% with my existing sand. I planted it in a spot where it gets alot of sun, like the info on the plant said to. The younger fronds have started to take on a bronzish hue. None of them have died completely or fallen off. Could this be caused by a fungal issue. I also am worried that something in the miracle grow soil may be causing damage too.

Please help!
Thanks,
Beck