Recently one of my guppies has been acting realy wierdly. Every now and then he will just stop swimming suddenly as if he has frozen then (It's hard to explain), but he seems to have little fits. He just shakes and cant control what he is doing.

After that , (It only lasts about 5 seconds), he will rest for a while on the plant that is there and will stay there for a while. It doesnt happen everyday, but at least once a week. It's realy wierd. He has been doing something similar since I have had him, (having little fits), but that was only every now and then or if I did a realy big water change, but now it seems to have gotten worse.
Both before and after it happens he seems fine and swimms with the other three and eats fine (usualy the first to the top!!

) I don't know whats wrong.
Also, Monday morning, before I went to school, I noticed he was swimming on his side near the surface, and couldn't turn the right way and couldn't swim downwards. He did eat the food though. But by the time I was home from school, he was fine again, and was hungary again!!
Could the 2 things be connected?
What could be wrong?
Can I do anything to help?
Thanks for your help before hand,
Gwenz
