There's always been this slurpy sound every 5 seconds or so since I set this aquarium up. I've tried different speeds for pump and also removing the original sponges and using different sizes.
It has been quiet once for weeks until I cleaned the sponge in water. After putting it back, it's continued to be noisy
How can I quiet the drain ?

It has been quiet once for weeks until I cleaned the sponge in water. After putting it back, it's continued to be noisy
How can I quiet the drain ?



