Hi, I've added a few plants to my tropical fish tank (no fish in there yet though). I only have gravel with no soil substrate so I put some root tabs in when I planted my dwarf hairgrass. However, it's been about 3 weeks now and they just seem to be dying? My other plant is happy and is growing several new leaves but the hair grass has mostly gone brown. I had an issue with hair algae but I managed to get most of it off. Does anyone have any advice? Is it dying or do I just need to leave it in there until it recovers? Thanks!