Agree. Providing calcium is what we try to prevent in general. For these it is a USP !Fahn said:I've used these, they caused a hardness spike that killed a bunch of my shrimp. They're gimicky as DuaneV said. If you have adequate carbonate and general hardness, you don't need to worry. These leech minerals at an unchecked rate and caused me nothing but headaches.
Isn't it strange they should provide calcium then?guppgirl said:I have those in my tanks, they do absolutely nothing for the GH and KH. I'm thinking of removing them, but there's a lot so it's going to be a PITA.