My tank is only about 2 months old. I don't think it's fully cycled yet, but I used a liquid test kit and my parameters are a little off.
I'm using an air pump for the filter.
I thought the sponge filter might not be adequate because there's just a ton of detritus from what I suspect to be mostly the tetras' feces. And since sponge filters aren't really mechanical filtration I thought this might be a problem.
Though I read that just leaving all the poo is fine.
Anyone have any experience?