I have used and sold a lot of the Biopellets from Thrive called Biostimulant crush, in the customer tanks I've seen it has worked beautifully but water flow has to be tuned correctly and about half the dosage recommended, what sets it apart is that it has pieces of arogonite which make it more porous/abrasive. Just my 0.02. Have not used any other biopellets material. Oh and compared to GFO it lowers nitrate and phosphate BUT it may lower one more than the other depending on the water chemistry
Sent from my EVO using Tapatalk 2