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I have a Tokina 100 mm on my Nikon D7000 and love it. I also wish I had a 50 mm macro lens as well. It's hard to get a full shot of a lot of my coral when I am shooting top down. Here is my tank thread with a lot of my pictures.
https://www.reef2reef.com/threads/bigjims-155-tank-thread.257840/page-3#post-4166667
I have a 105 macro Nikkor and I love it. I also have the 200 mm macro nikkor, gets you 1:1 from 16 inches away, but not very practical for corals ; both are very expensive lenses, but are super sharp. A 60 or 50 mm macro would be very useful. Briefly, both the 60 and 105 mm macro nikkor will give you a 1:1 reproduction ratio, but the 60 will do it at a substantially shorter distance, so it is better when working on tight spaces (eg top down shots, where your are limited to how far you can go up above the tank); the 100 and 200 mm will be better for fish because you can take close up pictures from far away, so the fish are not spooked
I would say that's a pretty good deal on a Tamron 90mm. I've been keeping an eye out for a good deal on em. Just make sure you get pictures with a flashlight behind the lens so it shows any dust/mold/fog trapped in the lens itself.