Wow, that freaked me out. First I wanted to give a HUGE shout out to: http://www.youtube.com/user/ImiStatuesEye He gave me the link AND what to go read up on. I'm going to post the link AND the contents on this page just in case that servers goes down. I want to make sure folks can find this critical info. Here is an EXCELLANT ARTICLE on discus health issues: http://plymouthdiscus.com/discushealth.html My specific issue is called Dashing Discus. This info is from Chris Ingham author of Discus World, the complete up to date manual for the discus keeper. Based on this info below this sounds like a GREAT book. Here are the details on that DIRECTLY from the web site: Dashing Discus (Swimming fast into the sides, or jumping out of the tank) Now and then discus can turn into exercet missiles, dashing and darting in an erratic, skittish, jumpy manner. All water tests prove fine and there seems to be no reason why they have become so unsettled. So I am given some room in this book to look at this commonly growing problem, what might have caused it, and how to correct the problem if you are unlucky to experience it. This is a growing problem that seems to turn up from time to time for discus keepers. It often leaves the discus hobbyist desperate to do something to help his/her beloved fishy friend. It doesn't seem to matter where the discus come from, whether it is Germany, Asia or English bred. Or where the discus has been purchased from here in this country, it seems to affect any discus, in any situation, at any time. But it can be controlled or stopped with some forward planning and basic maintenance in some cases. It all starts with the discus feeding and swimming normally, and going about normal day to day business. Then with no reason just one of the discus will dart across the aquarium, bashing into the side of the aquarium. Many have been killed out right by the blow, and some badly bruised and concussed. The strange thing is that it does not affect every discus, just one or two. This is very distressing for the discus keeper and the first thing most hobbyists do is to quite rightly test the water to see if any problems with water quality are evident. When all tests prove to be fine, this is the point the discus keeper switches to panic mode, and contacts every discus dealer they know or can find for help to solve the problem. But one thing is certain. Many times discus keepers have just changed plenty of water when confronted with this problem and it has stopped this alone brings us to the conclusion that it is connected with something in the water. In all cases, carry out large water changes when ever the problem arises causing unsettled discus will help greatly confirming this theory. This alone seems to stop the discus dashing around the tank for a while. Don't be put off keeping discus because of this, it is not that common. But from time to time this is something from all over the country I hear now and again. So because this has never as far as I know been covered before, I feel it is well worth looking at now. We will need to go through this stage as a process of elimination to get to the route of the problem as it could be a number of reasons. Some say it could even be a parasite, and I will cover this after we go through the main common causes first. STEP THREE: Check all electrical equipment. Even if you can't feel any electricity in the water, that does not mean it is not present. Even low voltage in the water can make some discus go crazy. I found this out a few years ago when I had a cut on my finger. It was only when I placed this finger into the water did I feel a sharp pain from the electric present in the water. I checked all the heaters, in case any glass casings were damaged. All was fine. As soon as I placed my hand with the cut into the sump filter, I felt a large tingle from the water. This was where the clue was. My main water pump was the only electrical component in the filter, so I turned off the power to the pump. Hand back in, no tingle!! The answer was the resin around the motor in the main pump had broken down and low voltage was getting into the water. The discus was picking this up through there sensitive lateral line that picks up electrical signals in the water. Apart from some were finding it less comfortable than others. After a new water pump was fitted, no more problems and the discus settled down again. I only had room for step three which I think is my issue. :-( The other items are common sense around water quality, parasites and basic fish health. I would NOT have thought it was electrical until reading this.