Okay, every night, everyone in the house heres a clinking noise, recently, I got up to find out it was Aussy trying to push the heater behind the filter (the heater in the tank isn't working for some reason, and we aren't getting a new one until it gets a bit colder - summer here and thats HOT!)

Anyway, I did a waterchange and when I went to move the heater over a bit from the filter, Aussy went NUTS!
He smacked into my hand and basically PUSHED me away!

I love oscars - they have such personalities