HBH balence blocks? good bad?

[vanzea]

hey everyone i was wondering if the HBH balence blocks are a good ting to use for calcium?

 

[bertoni]

I wouldn't use a product like that because there's no way to control the rate of dissolution. B-Ionic is a good way to get started with supplementation. This article goes into details on various approaches:

http://www.advancedaquarist.com/issues/feb2003/chem.htm

 

[drummereef]

Yeah, those are definitely not a good idea. Please read this too.

What Chemicals Must be Supplemented
http://reefkeeping.com/issues/2007-04/rhf/index.php