Define "Color correction"? Is bumping contrast and saturation to make things pop considered color correction? You don't need photoshop for that - the viewer that came with your digital camera has all that. Its what I used for years - until July when I started using Photoshop.
If by "Color Correction" you mean white balance adjustments, exposure, shadows & highlights, removing the blue, and putting in the fishy's real colors, well, I believe all that works best in moderation.
I use that type of voodoo on my dark water wide angle stuff. Which is to say, rarely. On about 80% of my pics, its just de-flock, clean up the noise, contrast, and saturation to get colors to pop. Its rare I even crop anything these days.
I agree - I like the "natural" look, but in my opinion the pic above would benefit from some "color correction" - in as much as the fishies have bright yellow bands on their silver sides - and the photo above is way too monochromatic to appreciate that. The fish are the same color as the background and the water and each other... Bringing out the Yellow so it just POPS would make this pic much more pleasant, and is likely why the shooter took it in the first place... because all that yellow is striking.
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Ken