Prodibio's Biodigest is a natural mixture of live bacterial strains to help reduce and remove nitrates and phosphates through bacterial digestion.
Dose your tank every 15 days. One standard vial treats 30-250g; one Pro vial treats 250g to 2500g. Prodibio doesn't spoil, and you can't overdose it.
Biodigest comes in two sizes: 30 standard vials, or 10 Pro vials.