How long ago did you make the switch? Give it time, he may calm down.
I may be wrong, and I am open to be corrected on this, but I have always been of the opinion the fish do not see a reflection of themself in the glass. I say this because when I approach the tank, either from the end or front, they all go nuts looking for food - if they were seeing a reflection, they could not see me......
There is however a situation that makes the glass become reflective; when the tank lighting is intense and the room outside the tank is quite dark. Its like the way you cannot see out the windows of your house at night when the inside lights are on; the extent of this effect is proportional to the properties of the glass (internal reflectance value) and the difference in light intensity.
Is your fish fighting the end panels, or all sides? Do you find this happens only at night?
- By letting end panels get dirty i.e. dont scrap the algae, the reflection will deminish.
- Try place a lamp next to the tank, so that when the room is dark the immediate area next to the tank is brighter.
Hope this helps some.