check out this photo. the left is the "new generation" tube, and the right is the previous "coral light" bulb.
I prefer the one on the right myself (the non-"new generation" bulbs) but everyone has their own colour tastes. One of the advantages of T5 is that you can fine tune the colour to your own personal taste.
The left has that pastel nightmare zeovit look
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I once had a Big tank...I now have two Huskies and a coyote