Awesome! Tank looks sweet! Would love to have one that size eventually. I wouldn't bank on the zoo taking your arowana. They often create those exhibits with a desired stock list in mind and once they have them stocked, there is very little wiggle room. Occasionally they can take tank busters from hobbyists, but not very often at all.
55 gallon Planted Tank - 10 gallon Reef - 5.5 Pea Puffer
2015 AA Fantasy Football Champion