hm, well now my c02 indicator is blue and there is barely any surface aggitation.
Is it right that there is only one bubble every 6~7 seconds... That seems like such a big drop because last friday, it was one bubble every 4 seconds. I always hear people having like 2-3 bubbles in One second.
There is still surface film though. This time, its realy small and when i mix it up, it doesnt cause anything in the water although when i put one finger on top, it makes it like spread apart and look really cool.
I remember one thread where lauraleelbp (i think) said that it is fats and oils, which is common in new tanks. But this tank isnt that new, not in my opinion anyway, its been running for about 5 months.
Is the probably the gravel? I am using inert gravel right now, and if i remember correctly, it started having surface film around right after the time i did a substrate switch.