Not too bad. First critique is you really don't need to bump your own thread when this forum generally only sees a few posts per day. That aside, my biggest critique would be to crop most of your photos. You need to decide what is and is not important in your photos. If you have too much of the unimportant, it detracts from the important. Also, you generally want to avoid putting your subject dead center in the photograph. Now, as you crop, remember your "subject" may not even be the whole fish. It's wherever you want the viewer's eye drawn. Maybe it's the entire animal, maybe it's just a part of it. Often times the eyes are the main subject. That's not to say you can't place the subject in the center. For example, your picture of the open brain, I think that could work. The circular shape of the coral, plus the lines leading in can pull the eye into the center and make the photograph more dynamic. I'd prefer a perspective more like your picture of the plate coral, though. The top-down perspective in this case makes the coral look flat and not as interesting as it could be. I like the compostion of your picture of the anemone crab, but as you've seen, photographing objects in the corner of your tank is tricky at best. There's usually just too much distortion, distracting reflections, etc.
The last bit of advice I have is to use Photoshop or some other editing program to clone out (or just use the healing brush in Photoshop) the random little specs you'll inevitably have (very apparent in pictures 1 & 5). But you've got some very nice image quality, so you're halfway there. Almost everything else I've said can be fixed in post processing.