Betta With Bloated Belly, Otherwise Fine?

[Raticataticus]

Well I have moved Fred into a small container and I am treating him with Epsom Salts. I am thinking severe constipation as I did not see many poops when I was changing the tank water. Hopefully he will poop over night.
 
In other news, after stirring the water up during the water change I have spotted some tiny little worm like things wiggling around in the tank. At least 3 of them. They are smaller than this slash / and are either white or see-through in colour. Only saw them as I turned the lights on and was watching the loose plant leaves and stuff go round and round the tank while I was on the phone. Could that be a parasite of some sort?
 
Also found these two little feckers who I have removed and put in a glass. The lighter brown one on the bottom is "flat" if you will and isn't really moving, the other guy is a regular snail shape and he is absolutely cruising around. I am guessing these two came from some new plants that I recently bought.
 

 

[Raticataticus]

Well I put Fred in a container with the recommended amount of Epsom Salts over night. Took him out this morning because he looked so sick and pale. So now he is back in the regular tank. He didn't poop over night while he was in with the Epsom Salts. He definitely seems worse now than he was before the Epsom Salts. I am considering just going ahead and treating him for dropsy.