From what you describe it sounds normal. 14 and 20K will promote less glass algae. I would be more concerned if you ray maybe a 10K bub. Those bulbs love to grow everything, but will shift down into the yellower spectrum (below 10K) as they age and pretty much can end up looking like our yellow sun.
At any rate, it sounds like your tank is basking in the winter light just like my tank LOL. If your tank is on the main floor and you have lots of windows, ya this is a challenge! But more or less normal (ish).
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