Don't like they way they looks. Would much rather have some bio blocks of some sort neatly stacked in there.What is wrong with the 300 watts heaters you are using with that contoller? That's a good and common approach.
So I got that filter block today and put it into the water flow section between the center chamber and pump chamber. As with most things I try, there is always something I overlook or don't think of.
The water takes longer to run threw the inserted sponge, so the pump pushes water out of the pump chamber faster than the water can flow threw the inserted sponge so I had to turn my pump down. Which I truly hate to do since I try to have it pushing as much as possible. The sponge was a few inches thicker than the slot. I squeeze it a bit to get it to fit in there thinking that would give it a nice snug fit so all water runs threw it, and it does. But maybe if I didnt squeeze as much the water would flow threw a little quicker allowing me to turn pump up a bit? I doubt it though. I'm currently just letting it run for a few and gonna check it in a couple hours.