Well, my new boy Strausse seems to be stressed out still from putting him into his new home yesterday, a 7.9 gallon Fluval tank called 'Flora'.
He does have a heater, and an adustable filter, I have the filter flow so low I can just BARELY feel it touch my fingers. His tank is staying at roughly 25C, it goes up a degree and down agree when the heater cuts in and out.
So he seems fairly active, like he's swimming around, but all he does is swim against the tank's sides... I think he can see his reflection in the glass(It must have mirrored sides or something). I'm mean, that wouldn't worry me too much if he wasn't constantly show his stress stripes and 'pecking' at the glass every so often. So he swims, swims some more and then half-swims, half-sinks to the bottom of the tank, and rests. He looks like he's panting when he gets to the bottom, his gills are moving fairly fast, and his mouth is in sync with his gill movement.
He has a giant flowery plant that sits near the back, it's fake, but he has yet to use it, if he were to check it out, he'd realize that it has some hidey places in it!
EDIT: He also seems to have a bit of trouble swimming completely horizontally. Like his tail sinks back in the water... I'm thinking it may be weighing him down? He also has a large dorsal fin which seems to affect his resting. For instance, if his dorsal fin droops on way he starts falling over, so he'll swim a bit until his dorsal fin is resting against the glass.