What's wrong with my Grandad's cactus? I repotted it recently using worm castings, pumice, cactus soil and small amount of compost soil. Haven't been too great with feeding, so could be lack of nutrition... I've fixed that now, it had it's first feeding of the year last week. Maybe too much sun, underwatering? It's on a south facing window, in pretty direct sun light. I water using tap water when the soil completely dries out. Help would be much appreciated, it was my Grandads plant who passed, and I don't want it to die... A few of the cactuses have already died. It was in the wrong soil though in indirect light. 🫢 Since moving into direct light, they've been getting crispy at the top. Originally by u/becky8610 on Reddit: https://tinyurl.com/28jcdy6k