Before putting up some pictures, just wanted to mention that the problem is more complex then what I presented before, but I think it will be enough to get a bit better pictures with minimum effort.
All the pictures were taken with an iPhone 7plus through my dirty glass without turning off the powerheads and all the adjustments were done on the phone. Please excuse my dirty tank as I'm in the process of reviving it after almost 2 years with no skimmer, water change or feeding it. Auto top-off was adding normal water as my RO did not work for the last 6 months.
Picture 1: JPG directly off the camera with no adjustments, just reduced the size
Picture 2: taken using Lightroom in Raw (DNG), adjusted quickly the white balance and exported as JPG and reduced size. Still to much violet in the picture.
Picture 3: taken using Lightroom in Raw (DNG) with no adjustments, just exported as JPG and reduced size.
Picture 4: taken using Lightroom in Raw (DNG), adjusted quickly the white balance and exported as JPG and reduced size. Still to much violet in the picture.
Picture 5: same as above, just different white balance, more realistic.
Picture 6: taken using Lightroom in Raw (DNG), cropped, adjusted quickly the white balance and exported as JPG and reduced size.