Just another question?

I was just wondering,can anyone tell me the biggest
difference between DT"S & Phytoplex Phytoplankton
the main reason for wondering is the price difference
in my neck of the woods DT"S is 40 bucks for a 30 ounce
bottle and i seen in a catalog that they sell the Phytoplex
for 28 bucks for 64 ounces.I know that saving a buck
isn't alway's worth it,but if we can then that is great,
especially in this hobby.
 
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