Hi everyone ! I noticed these brownish blackish edges on my fig, could it be root rot? My plant had a very hard beginning, once brought home from the nursery, he had a hard time acclimating. He dropped a few leaves and was droopy for weeks. I was so excited that just a few weeks ago he sprouted two new leaves, to me a sign he was happy. Today I spotted these and am worried its root rot. If so, how can I save him and prevent him from dropping more leaves ?! He gets lightly shaded east facing window light, watered when meter reads 4, and has a mix of cactus and regular soil.