I thin you might have it set up wrong, although I'm not 100%.
The first compartment; on the right, if you're looking at the tank from the front, the one with the slits at the top, should have the sponge in it.
The middle one has your ceramic rings.
The one on the left should have a hole that the powerhead fits through, and the heater.
The first compartment; on the right, if you're looking at the tank from the front, the one with the slits at the top, should have the sponge in it.
The middle one has your ceramic rings.
The one on the left should have a hole that the powerhead fits through, and the heater.