Thanks for your advices
That sounds like a good idea indeed but i am afraid i am going to "really like the 5700k look" as you said so 2 hotter strips sounds a bit much in that optic. 1 will be enough, but that means 4 LDD... decisions decisions ! Well done for having me doubting again
Too bad there isn't a colder version of thoses strips, that would have been gold !
You would use a 48V power supply and use two LDDs, one LDD driving two 5700k strips in series, the other LDD driving 2 3000k strips in series.
If you're worried about not enough light with "only" two strips, you can make a quick comparison to the popular beamswork fspec fixtures. To get an idea of PAR levels, the beamswork 48" strip is rated at 5200 lumen and has a PAR of 44 at 20" depth (I'm assuming your 25g is 24x12x20). That would mean you get 44 PAR for a 24" long beamswork that's putting out 2600 lumen. Your strips are rated for 2500 lumens for each strip, so you would get double that: 88 PAR running just two of the strips. To put that into perspective, 50+ PAR is considered "high light" so you'll be more than adequate no matter what combination you run.
When making LED lights you can get into a "more power and more light is better" spiral, but for this rig you're probably going to run into algae issues if you run "just" 2 strips at more than 50% brightness.
The reason I like the 5700k and 3000k options are that my house is filled with 2700k incandescents, and when I'm around the house in the evenings, I don't want a super blue-looking tank; everything looks more natural at the lower temperature, and I still have the ability to "match the sun" during the day. A good note of comparison: 120W of lights run at 100% over a 75G is blinding. I have them comfortably running at just 15%, or 18 watts, on a tank 3x bigger than yours!