Hi Pinkneyss,
Sorry about the misunderstanding, but as I'm french, it's not that easy to be cristal clear with another langage than my natural one!
Well, for example, what I meant by "first row subject" was some kind of "plus" in your image, that can make it a very unique one. Your zoos are great. But wouldn't it be even greater with, for example, an hermit crab walking on it, or a fish seeking for food inbetween the polyps? You see what I mean? The "landscape" would become a "landscape with action", and the image done would be much nicer!
Is there's no action possible, then, another "first row subject" to emphasize the scene would be to play with the apertures of the lens and the framing, to "inflate" the image with more sense. taking a unique point ofd view guiding the reading of the image, for example, focus on a single polyp or little group and put the rest in the blur by reducing the aperture of the lens, or frame your image closer, to impact the reading with macro details... I don't know if you see clearer now, what I meant... not easy to talk technique only with words + with a foreign langage!
well, I hope I explained better. Please let me know if you need more details, I'll be happy to help!