Froggy - I should have new pictures and complete parameters tonight
Thunder - I get what you're saying, and think that might be true in a glass aquarium. But either my fish hold a big-time grudge against acrylic, or they are seeing their reflections. They will be swimming along happily in the middle of the tank, suddenly catch a glimpse of the wall of the tank, and charge it, then "chase" themselves up and down the glass a bit - and it has nothing to do with where I'm standing in relation to the tank. It also lessens when the lights are off in the room and in the tank.
I do think the introduction of the new guys last night incited a little bit of this behaviour and expect things to be calmer when I get home tonight.