Help, cactus not doing well

[Megamurph]

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Please help me save this cactus.

I have learned that they don't need direct sunlight and only water once a week. I know the soil isn't right either, came with the plant. help, should I re-pot now?

[majcka]

Hello there.

This is NOT a cactus. It is an Euphorbia trigona. Not necesarily something wrong with it. I have one quite big for some time now (I adopted it) and it is just as brown. Doesnt look so nice, but it is perfectly healthy.

To drop leaves is an ordinary thing too. It could be from light difference or just a phase.

But I always keep an open mind, so please wait for more answers.