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Should be fine for fresh water, I've never converted any tanks from salt to fresh so not sure if it'd just need a good cleaning/descale or if there's some issues with converting. Someone likely makes a 6500k version of those bulbs though... Im not sure if the 10000k would support plants or not but if you don't plan on planted it really doesn't matter what lighting you use then. I'm not huge into salt either, I had a biocube 29 for about 5 years before I moved across the country and left it with my brother. I'd love to get another one going eventually thoughI'm guessing for freshwater use the lamps are NG? Remember your talking to a dumb freshwater guy.
Sorta, mainly to promote evaporation to keep the water cool while they're running.