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Looks awesome! Did you shoot right up against the glass or do you have a top down tube to shoot in?
@d2mini @saltyfilmfolks might have some good tips for you but that's a great picture you took!

it looks like you ,may have just missed focus a bit on this one, two things, If your on a tripod, stop down 2.8 to an 5.6(aperture priority mode)
and try to stay flat to the glass.(distortion)
On the first one(excellent BTW) I would NOT stop down. the shallow depth of field is used to excellent effect.
try aperture priority. (Note the color balance and asa of the pics and set to aperture priority.)
there is a technique called bracketing, pic a stop for good exposure, and shoot more open, then more closed . gives you choices on depth of field the effect.

The first looks great!
Salty pretty much has you covered.
It's also generally good advice to turn off your circulation pumps to slow down coral movement.
Aperture priority can work well, and if you need a faster shutter speed to stop movement you can try raising your ISO a bit.
You also might want to see if your camera will let you choose/move the focus point. This way you can keep the camera still, but move the point to the area you want in focus.
The camera may be trying to guess what you want in focus which works well for people, but not so well for something as abstract as coral.
And the old trick of focusing and then recomposing is tough with macros because the slightest change can really shift your focus.
I forget people use auto focus.:DYou also might want to see if your camera will let you choose/move the focus point. This way you can keep the camera still, but move the point to the area you want in focus.
The camera may be trying to guess what you want in focus which works well for people
You will.:p Keep shooting!:)I do not know what aperture priority, bracketing, etc is
I forget people use auto focus.:D
You will.:p Keep shooting!:)