As an aquarium fish keeper, you create a thriving environment for aquatic pets. Choose a suitable tank size based on the species—small tanks for bettas, larger ones for goldfish or tropical fish. Maintain water quality with regular testing, filtration, and partial water changes (20-30% weekly). Feed fish a balanced diet, avoiding overfeeding to prevent pollution. Monitor temperature and pH levels to match species requirements (e.g., tropical fish need 75-80°F). Decorate with plants and hiding spots for enrichment. Research compatibility to avoid aggression. Quarantine new fish to prevent disease spread. Regular maintenance ensures healthy, vibrant aquatic pets. For more tips, check online forums or aquarium guides.