The platy with the scales opened up like durian is suffering from Dropsy. At this stage, it's probably beyond what you can do as an aquarist to help it. The good thing is that Dropsy as a condition is not infectious. The bad thing is that dropsy is usually a secondary infection resulting from the malfunctioning of internal organs. That might be infectious and can be a variety of things.
As for the shy fishes, there could be many external conditions that could lead to such a behavious. Only you will be in the best position to find out.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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