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Please halp me /growmen/!!! My cactus has been happy and healthy for about 4 months, it's even doubled in size in that time. Now suddenly it's starting to shrink (like it's drying out?) and the bulb on top is developing dark spots. These aren't external (mold, etc) they're dark spots just under the skin I guess.
It's not squishy or rotting or anything, and it's still firm and hardy. I followed the instructions perfectly, it gets watered only when the soil is 100% dry (about every 10 days), it's in a window with some direct light and mostly indirect light.
Does anyone know what's going on before it's too late??? I don't wanna lose my little buddy :[