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That almost looks like Blue Green Algae (BGA). But I could be wrong. If it's only on that clump of moss, remove it along with the cave, and treat it outside the tank. If nothing else it minimises the spread.

I had to set a tank for the few carbon rili I had left. The shrimps were passing away one by one in a tank where I could not find any reason why they were doing so... I an emergency rescue, I dressed a new tank, 30liters, new soil, plants, new sponge filter, and I dosed some Bio Nitrivec (SERA). 2 hours after, I moved the shrimps in that new tank, and crossed fingers... That was a success. Not only the shrimps stop quiting, but they start again breeding after few weeks, and now I have recovered a full healthy colony from the very few I had left (3 females 4 males). They are about 400 now ^^)