Do i have to keep fixers (Ilford Rapid Fixer) in a light tight bottle?

... Developers yes, light and with as little air as possible.

Really? I know about little air, to minimize oxidation, but light tight? Kodak sells HC110 concentrate in a translucent bottle, and I have never used an opaque bottle for developer. Does it undergo some sort of photochemical degradation?
 
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