Please research this or get confirmation here from the experts, but wanted to share as i have not seen this suggested.
I did this search on the assumption that Hewbie is constipated as I had seen that mentioned along with the upside down swimming and bloated swim bladder…
To help a constipated or blocked puffer fish pass waste, use natural laxatives like high-fiber foods (such as daphnia or skinned, squashed peas) or administer an Epsom salt bath (1 to 3 teaspoons per 5 gallons of water) in a hospital tank to relax its muscles. [
1,
2]
Dietary Remedies
- Daphnia: Feed live or frozen daphnia; their chitinous shells act as a natural, gentle purge for fish digestion.
- Shelled Peas: Offer a tiny piece of a cooked, squashed green pea (for smaller species) if the puffer will accept it.
- Fast the fish: Stop feeding regular pellets, flakes, or heavy meaty foods for 2 to 3 days to let the digestive tract clear. [1, 2, 3, 4, 5]
Epsom Salt Treatment
- Hospital Tank Setup: Move the puffer to a separate quarantine or hospital container with matching temperature and aeration.
- Epsom Salt (Magnesium Sulfate): Dose 1 to 3 teaspoons of pure Epsom salt per 5 gallons of water. This acts as a muscle relaxant to ease blockages.
- Duration: Leave the fish in the Epsom salt solution for 10 to 15 minutes while monitoring closely, then return it to clean tank water. [1, 2, 3, 4, 5]
Checking for Other Issues
- Internal Parasites: If the puffer has a pinched or sunken belly despite looking blocked or bloated, internal worms may be the real culprit. Treat with a dedicated parasite dewormer containing praziquantel or levamisole. [1, 2, 3]
- Foreign Objects: Check if the fish accidentally swallowed a piece of aquarium gravel, filter sponge, or plastic, which requires an experienced vet and cannot be passed with laxatives. [1]