So im a 19 year old kid who is currently attending chico state and just a couple weeks ago i bought a baby arowana and put it in my 30 gallon tank. everything seemed to be going well while i was at home and my arowana was doing great. but i had to go to college so i left my mom with the job of taking care of him for 3 weeks untill i come home for 5 weeks. just today my mom called me with the knews that my fish was dead. i almost cried. so after once i calmed down i tryed to figure out what went wrong with my moms information. i am clueless. i had him in a 30 gallon tank with 2 small geos and black convict. any ideas?