I repotted my blue star fern about a month ago. Potted in orchid mix, draining hole at bottom, watered about once a week, I mist it randomly if I think about it.....it gets indirect light throughout the day. It's done well but I noticed yesterday the fronds are not standing upright any longer, and it seems to "split" down the center and the fronds are now drooping to either side. Is this normal with growth or have I done something wrong??? The ONLY thing I've done differently is that when I watered it about 3-4 days ago, I added a few drops of "superthrive" to the water