How do you treat guppies for internal parasites?

To treat guppies for internal parasites, you can use medications specifically designed for aquatic use, such as praziquantel or metronidazole, which target various internal parasites. It's important to follow the manufacturer's dosage instructions and potentially perform a water change before treatment to reduce stress. Additionally, quarantining affected fish can help prevent the spread of parasites. Maintaining a clean environment and providing a balanced diet can also support the fish's recovery.