15c is way to cold. try and keep it 20-25c.(had to do math conversion) are the pots on a cold floor as well. raising them off it will also help Could be wrong but it's looks like it drying out as well now
looks like its roots are dying due to overwatering or another issue if not (temps/ph?). id say best option is to leave it try to recover, maybe foliar feeding would help bypass the root issues if thats the problem but im not sure.
someone should be around with some solid diagnosis's certain hours around here are quiet due to US/UK mix of people.
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