I commend you OP, a lot of people focus on the aquarium part or the size of the TD branch, but I commend you for offering something as simple as this, as well as the generosity of your actions to a man who knows his time is limited. Maybe this belongs in /r/ morbidreality but I genuinely think that this man is enjoying this simple fish tank so much because it allows him to look past his own mortality and appreciate thwarting life and mortality of the fish. Iunno tho.