In Fish Tycoon, maintain tank health, food, and treatment before expanding the breeding program. Track parent species and outcomes so experiments reveal combinations instead of repeating blindly. Sell healthy common fish to fund research and upgrades, but keep breeding stock for promising traits. Match population to tank capacity and avoid spending all cash on speculative eggs or supplies. For a save or breeding issue, record game version, tank, parent fish, treatment state, game time, and the exact result.