Encrusting Monti Question

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Had pieces of green and purple/brown digita that ended up growing into each other, then the green started growing over the other. Thought was rather neat until all of a sudden both colonies crashed. Since both colonies had grown over a big piece of LR just left in the tank though even though algae started growing on the skeletons.

After 3-4 months of not a hint of life, the green started coming back.

Here's a old picture taken before die-off.