u probably just got them. they need to be acclimitized.
By the way, ID Sharks can grow to be 2-3 feet, so they are not an ideal aquarium fish at all. That oscar is going to need waay more than that fish bowl of yours too. At least a 75g aquarium for himself. They will also need, a good power or canister filter, a heater and meaty foods.
Final Word: Get A PROPER SETUP ASAP OR RETURN THE FISH!