I am using 2ft 4 tube versions of your Aquazonic T5 sets. It came with 12000K tubes as well. Just got some replacement 7500K tubes from Seaview 2 weeks back.
I replaced half the tubes with the 7500K tubes....visually cannot really discern the difference in colour temperature from the 12000K.
If you don't mind the no-brand tubes, they are going for about $9+ per tube.
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