Aquariums and Troubleshooting

Seth and I have recently invested efforts into an Aquarium. It's small, 14gallons, but promising. Seth is more invested than I am, because he invested with his pockets. It's sort of his thing, his aquarium. I'd like to be more involved, but I feel the aquarium is symbolic. It's like it's his personal space, his world in which he may play god. He gets to decide the fate of all within. I figure it's good for him to play such a game. Sometimes he feels out of control, unsure of his decisions and accomplishments, unsure of what's to come. I think subconsciously he sees the aquarium as a release. So I am content to watch from the side as he works his life out, toiling over the aquarium. I care for nothing but his happiness.

After purchasing the Aquarium, We(He) rinsed the supplies, filled the tank and let it sit for a day. The next day, we visited Bert's Pet World. There were multiple aquarium types to choose from, but the perfect type for us, Tropical Freshwater. Simon and George, two black, long fin Tetras were suddenly our new house guests. However, These two fish seemed not to enjoy our presence, constantly hiding behind the massive rock in the middle of the aquarium. We thought with time they would come around, but that does not seem to be the case. Two Swordtail fish: one male, one female, were our next purchase. They seem to be more active, both swimming around with nothing to fear. Seth has grown bored of the entire ordeal. Sadly, now he is plotting their demise, talking of new fish to come such as: Cichlids, Oscars and Piranhas. These aggressive fish are probably just verbal threats to those fish he finds upsetting. Although I wouldn't feel too save George, Simon, Pete and Madge. It's only a matter of time until he releases an aggressor into this tank full of peace.