what is that small square white rock thing call? i think it can keep good bacteria?

[jaylach]

What is seashem is it has a rock version that i'm talking about? And is seachem and seashem the same, what is their different?

It is Seachem, not Seashem. It is a range pf products for water treatment and has nothing to do with your item in question.

Please supply the requested photos and information that I requested.