U could wait a couple of days on the ph and ta. Dont wait on the chlorine, without any fc it could turn anytime and it turns quick. Without cya, clorine can burn off quick, could only take 30 min. You said u already added cya though, so u should b good.
Couldnt tell u about black stuff, someone witj more experience would b better. Could be dirt or if sandy, dead algae
Couldnt tell u about black stuff, someone witj more experience would b better. Could be dirt or if sandy, dead algae