Hi Kev,

The filter I'm using is the sponge filter that working at 300L/H. Is it powerful enough? This filter is giving me a little bit of problem. Sometimes it does give out tiny air bubbles which I know is good as it'll aerate the water; however most of the time it doesn't. My friend told me
that the motor might be malfunctioning and ask me to upgrade to a new one.

Thx & regards,
Kcaand