Photo help - Proper colour - Canon SLR

[Coasting]

Okay so I seem to suck at taking any kind of decent photo of my tank be it all in 1 or a close up of my coral.
I cant seem to get the colour right no matter what f-stop, speed, WB, or ISO I use and its driving me up the wall because I'm just not sure what to try. I see so many stunning photos posted on here, even cell phone photos seem to be better then what I can take!
Nevermind how you guys show the fluorescence in photo.

My shots seem very... greyed out.

I've given up on shots that are clear and not blurry since I have a bow front.
Camera is a canon 7d




Maybe somebody can share what settings they use, gah!

I've used SLR's for years and never have an issue with them.... For the most part the FW tank is easy enough but SW photos are driving me insane!

Thanks!