Hello people of the world! Im looking into getting one or two sponge filters for my compressiceps tank, 33G. My reason for this is that my two fluval u4's are becoming more noisy. This i because i use aragamax sugar sand to keep my ph buffered and is a necessity in my tank. My theory is that a sponge filter or two would allow sufficient filtration with less risk of the substrate accessing the motor/propeller causing the noise. My questions are: what type of sponge filters do you know of that are compatible with powerheads? How can i in corporate my bio media into them (ceramic rings)? Any advice welcome, Thank you.