Sharing my experience here with fellow reefers on my experience and comparison between the both products. Recently finish my first 250 ml of Nitra Guard Bio cube and bought a new bottle of Polyp Lab Bio sphere to tried it out since the price is much cheaper .
After opening the bottle of the New Polyp Lab Bio sphere, i was surprise to find that the shape of the cube is different from Nitra guard which i used previously. The color of both product look rather similar though which is clear white.
Opening up the bottle
Above is the photo of the Polyp Lab Bio sphere.
Comparison between the both in term of the shape.