Im a Fisheries and Aquaculture student at SUNY Cobleskill in NY. For my project I am taking care of a 200gal tropical saltwater tank in our state of the art facility on campus. Im starting from scratch ( just water and gravel ) my professor wants a variety of easy to take care of and hardy organisms, from fish to inverts, that are able to coexist happily. The budget I was given is no more than $200. Where do I start?