Not the writer of this information below.
Constipation- This is often caused by a diet without enough variety, or by feeding too many starchy type foods. Symptoms: If your fish is having trouble passing feces, or if they are forever trailing behind a fish, your fish may be suffering from constipation. Treatment: Feeding your fish a diet with more roughage and a greater variety sometimes helps! Feed live foods such as (wax worms, brine shrimp, tubiflex worms, etc.) peas, spinach. If you can get your fish to eat one grain of Epson salt it can also help aid with the constipation. Soaking dry fish food in some water taken from the tank will soften the food and help in the digestion process.