The "hard rocks" are likely a decorative layer of glued pebbles or loose stones on the soil surface. This makes proper watering difficult.
Do not repot. Coral cactus has a fine root system that must dry quickly. A larger pot will hold too much moisture and cause root rot. Leave it in its current pot once the surface is clear.
Rescuing a Stress-Damaged Columnar Cactus After Relocation
Will Coral Cactus Pups Develop Crests?
Complete Care Guide for IKEA Mini Cacti/Succulents
Coral Cactus (Euphorbia lactea 'Cristata') Care: Glued Rocks, Watering, Repotting
Coral Cactus (Euphorbia lactea crest) Odd Growth: Graft or Sport?
Coral Cactus Splitting After Heavy Rain: Likely Growth Quirk
Coral Cactus (Rhipsalis cereuscula) in Glued-Stone Pot: Repot or Pry?
Ornamental Cactus Crown Rot: Surgical Removal and Cultural Correction
Follow-Up Care for a Toppled Columnar Cactus: Stabilization and Recovery
Identifying a Mystery Columnar Cactus
Assessing a Coral Cactus with Brown Grafted Top
Treating Spider Mites on Coral Cactus with Soapy Water Spray
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