water goes through the tube to the box(the one on top of the tank) and then the water gets filtered by the sponge(filter media) which then lets the filtered water out though the tube(the thing i encircled).It looks like you are using a powerhead to pull the water into the filter, but then what happens from there?
my water temp should be a constant 76-80F right? i think my heater is unable to provide the whole tank with the exact temp coz right now it gives 81-82F.
should i get another heater?