While Banggai Cardinalfish are generally considered hardy, they are still susceptible to the common ailments that affect marine species. One of the most familiar issues is marine ich, or Cryptocaryon, which presents as small white spots on the body and fins, along with scratching behaviour and laboured breathing. Bacterial infections can also develop if water quality dips, often seen as redness, cloudy eyes or signs of fin rot. In some cases, they may also suffer from internal parasites, particularly if they are wild-caught, which may result in weight loss even when the fish appears to be eating. Prevention is always better than cure. Keeping a stable tank environment, performing regular water changes of around 10 to 15 per cent weekly, and feeding a varied, nutrient-rich diet can help avoid many problems. New fish should be quarantined before being introduced into your main tank to prevent spreading disease. If your fish does fall ill, early intervention is crucial. Isolate the affected fish and use reef-safe treatments where necessary. Always monitor behaviour, appearance and appetite – even subtle changes can be the first sign of a health issue.

Caring for a banggai cardinal fish takes some effort, but the payoff is immense. With the right tank setup, a tasty and varied diet, and a bit of TLC, you’ll have a dazzling centrepiece for your aquarium. Got any questions or your own cardinal tales? Drop them in the comments—I’d love to hear from you!