Turn off Biopellet reactor or Sulpher DeNitrifier?

[HiggyBrew]

Currently I have a bit too much going on in the sump area and am hoping to take something off line to simplify and cut some electrical costs. Please give me your opinion on which of the following would make the most sense:

1) Take Sulfer based DeNitrifier out of service.
2) Take BioPellet reactor out of service.
3) Take one out, and if tank stays good for a month try taking second one out.
4) your idea??

Note: I have a refugium, Kalkreactor with ATO, peristaltic pumps for Ca, Mg, and Carbonates. Plenty of live rock, a media reactor with GFO and GAC. AquaC-EV180 with Mag 9.5 and Avast auto head cleaner. 3 Vortechs (2 MP40, 1 MP10). No major algea problems, just a tad where there is blocked flow due to large colonies.

This is on a 125 gallon, 6' tank with an Aquactinics Constellation T5-HO (14 x 39w), 2 sumps tied together (25g +35g). Heavy stocked mixed reef with medium fish load...

 

[KCombs]

1) Take Sulfer based DeNitrifier out of service.
...then see how it goes

 

[radiata]

You neglected to mention your PO4 & NO3 readings...

IME, BioPellet reactors are great at removing nitrates, but no so great at removing phosphates. My DIY sulfur denitrifier keeps my phosphates at 6 or 7 ppm, and I'm happy with anything less than 10ppm. If you're happy with your NO3 and not with your PO4, drop your BioPellets and find another way to remove your PO4. (GFO?) If you're happy with your NO3 and with your PO4, drop your sulfur dentitrifier and use only the BioPellets. If both your NO3 and POP4 are too high, suggest you switch hobbies - PDF (Poison Dart Frogs) would be a good altermative...

 

[uglyfish]

You neglected to mention your PO4 & NO3 readings...

IME, BioPellet reactors are great at removing nitrates, but no so great at removing phosphates. My DIY sulfur denitrifier keeps my phosphates at 6 or 7 ppm, and I'm happy with anything less than 10ppm. If you're happy with your NO3 and not with your PO4, drop your BioPellets and find another way to remove your PO4. (GFO?) If you're happy with your NO3 and with your PO4, drop your sulfur dentitrifier and use only the BioPellets. If both your NO3 and POP4 are too high, suggest you switch hobbies - PDF (Poison Dart Frogs) would be a good altermative...

Biopellets (or any carbon dosing method) need 16 parts no3 to drop 1 part po4... if you want to drop po4, dose striaght no3.

By denitrifying on a tank with biopellets, you'll definitely need to run gfo cause your po4 will continually rise. You're starving the biopellets of the no3 they NEED to consume po4.

That's why zeostart contains nitrates... to drop po4.