Funny ,I use seachem on my selling tanks ,2 months running ,and coralline starting all over ,Tonyscoots84 said:i dont understand. people here have calcium reactors this and that and have trouble with growing coraline algae. i use seachems calcium liquid and i got coraline growing allover my rock. it just started on my powerheads. i also see it started on my front glass. very wierd...