Definitely not a bad shot! However, you didn't ask for Kudos, you asked for constructive criticism.
1. Shoot perpendicular to the glass. This means up/down and left/right. Square up that lens.
2. White balance is off here. It's pretty warm (yellow, versus cool which is blue). There's nothing you can do about that in the camera. It's going to take photo editing software. Most people use Photoshop, but it comes with a pretty hefty price tag.
3. Oversaturation. This leads me to believe you already have some sort of photo editor. The saturation is too high, the coloration looks a little over the top.
What was the ISO on the camera? Contrast is pretty high, and that's the hardest part about shooting under MH lighting. There may be nothing you can do about it. However, make sure your ISO is as low as possible.
Again, this is already a nicer shot than most. It just needs slight tweaks to make it really "pop!" By the way, is that a millepora growing out of the center of the cap?!