I think those Marineland fixtures take T8 bulbs...
If it were me I'd go with one bulb in the low 6700/6500k range and the other with a higher kelvin; either 8000k, 9235k, or 10000k.
It's really a matter of personal aesthetics more than anything else. Most bulbs between 5000 - 10000k will support FW plant growth.
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