Sea Lab #28

[Homburger]

Any one use SEA LAB #28 blocks for their tanks? Does anyone have any opinion on the product?

 

[Aquascaper]

Never used it and would never want to. Regular water changes are all that is needed to replenish lost elements IMO, with the exception of Calcium which can be added safely and easily on its own.
Placeing a block full of chemicals into a tank to slowly disolve is not my idea of keeping a tank healthy