Bubbles coming up from undergravel filter

[BKRJIM]

I checked mine again today, no dosing in three days. It was hardly readable..less than .25. The algea is 95 % gone too. My live rocks look like rocks again instead of carpet balls. Only drawback is my millions of copepods are all fighting over what algae is left after dark. I think i will get a nice big mandarine.