MK's Blood diamond is roughly $20 for 9.6 ounces (284 ml)
Bio-Culture SMW is roughly $20 for 3.4 ounces (100.5 ml)
Directions are identical:
For new tank setup, add 10 ml for every 100 liters (~25 gallons) of water. For maintenance, add 10 ml to 100 liters (~25 gallons) of water weekly. For water changes, add 10 ml in every 20 liters (~5 gallons) of new water. Use half dosage for saltwater applications. Avoid overdosing.
That's cost break down. As to which performs better- ???