I've found it's all about white balance under the LED's. Had to take a picture of a white card in the tank and reset the white balance around that. It made a huge difference, stopped the super blue saturation. I've been using our Canon SLR that's prob 9 yrs old with Sigma Macro lens (12 yrs old) and getting pretty decent shots. I'm just learning though.
Super random, but could you ID the pink/green zoa in the bottom left? I have one that looks very similar but I wasn't given an ID. Thanks