i have a 78 g tank with 2 albino oscar. i hav a thermostat and a internal power filter along with a under gravel filter, i used to change 60% of water weekly. but my question here is that do i need much filtration for my buddies? how about hob filter? is proper and effective or over filtration is good for oscar's growth? is proper tempature is responsible for the same? thanx for all ur suggessions...