Well everybody, the problem is solved
its really the EHEIM Liberty, actually hang on filters
im not using any filter right now, and the riccias are bubbling
actually, all my plants are bubbling, amazingly
im so happy coz i can feel the result of having a pressurised CO2 system
thank you everybody for the help
since my aquarium is so small, im running around 1bps-2bps
i just bought an EHEIM internal filter (Aquaball 220
anybody have feedbacks on it?