10-17-2009, 08:41 AM
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Welcome to the site. Your experience should really benefit everyone. You have an awesome job!
As you are probably already thinking, you have an interesting tank size. 90 gallons tanks can be frustrating, because you have a lot of water, but the length of the tank causes aggression issues that you don't really deal with in a 125. For this reason, given the extreme sensitivity of the fish, I would personally nix the Achillies Tang. That fish is crazy difficult to keep to begin with, and putting it into a 90 gallon tank will be a real challenge.
Another consideration will be water flow. Tangs are much more durable fish when kept in systems with high currents, and a Boxfish would certainly not appreciate that much flow. For this reason, i would suggest the Porcupine Puffer, so long as you are prepared to move it up to a larger tank in the future.
I also think the Niger Trigger will prove happier in a 90 gallon than the Cross Hatch, which tends to be very shy and reclusive when kept in smaller tanks.
Overall, it sounds like you have a nice project going. You should really start a build thread in the Pictures & Video area and post some pictures! Good luck!