Bio-pellets Vs. GFO for SPS what is best?

Run carbon and dose prodibio Biotim and Biodigest. i use one vial every two weeks in my 110g. Nitrates were 25 and phos was .10 before using them and within 2 days undetectible on both fronts. Been using them for about 9 months now and my sps have great growth and color is incredible. My purple monster grows about an inch a month, but my flow lighting and water stability attribute to that also.
 
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