it is called balance blocks by hbh. it is suppose to be a calcium and trace elemnent replenisher
badkjb2 Member Feb 24, 2003 #1 it is called balance blocks by hbh. it is suppose to be a calcium and trace elemnent replenisher
slick Active Member Feb 24, 2003 #2 Regular water changes work well to keep good levels of trace elements present in your tank.
