thanks for the info everyone - you guys are the reason why Inca is still alive - without any doubt.
Thanks for being so patient and answering all my questions.
Inca's tank is in my room which has a verandah in front of the window = very little sun. Even so, she seems to take it really slow during the day, and then liven up a lot at night.
For some reason, however, she has really slowed down tonight. Maybe she partied too hard during the day? I know I didn't open my curtains to keep the cold air out, so maybe she decided that the dark room was night and it was play time ALL day haha.
I'll let you know if she continues being lazy.