What size tank do you have them in?
How long has the tank been set up?
What are the symptoms they are showing?
What are the water parameters on the tank?
How many demasoni do you have?
Any other fish in the tank?
There are two links regarding treatment of bloat below my signature.
Let's get some more information (be as detailed as you can - don't leave anything out) and see what you need to do. Meanwhile, you can add epsom salt to the tank at 1 cup per 100G preventatively for those that aren't affected.
How long has the tank been set up?
What are the symptoms they are showing?
What are the water parameters on the tank?
How many demasoni do you have?
Any other fish in the tank?
There are two links regarding treatment of bloat below my signature.
Let's get some more information (be as detailed as you can - don't leave anything out) and see what you need to do. Meanwhile, you can add epsom salt to the tank at 1 cup per 100G preventatively for those that aren't affected.