Try the aquarium cam app, not perfect and tends to exaggerate colors somewhat but better than the washed out blue pictures without it.. couple examples, not great pictures but gives you a idea.
Before turning on the camera app aim at the tank, the iPhone has some sort of initial adjustment that makes a difference. If you turn on the app away from the tank and then try to take s tank pic it will be really blue.
After that use an app like Snapseed to adjust the blue level to match what your eyes see. Examples below:
TruVu clip on lense with orange filter. I’ll add a link if I can find it real quick.
8 bulb t5 (6x ati blue+, 2x ati purple plus)
1x orphek BlueSky led bar
1x orphek UV led bar