low orp

[Fastf1-chuck]

I'm starting and old tank back up 240g with 90g sump I have the new apex fusion and the orp level is always sitting around 230-250 and everything I read says between 300-450 also using the triton core 7
thanks for any feed back.

 

[Brew12]

I'm starting and old tank back up 240g with 90g sump I have the new apex fusion and the orp level is always sitting around 230-250 and everything I read says between 300-450 also using the triton core 7
thanks for any feed back.

I can't explain why, but when I first set up my new system (first one I started with an ORP probe) my ORP was around the same. It gradually increased to 330ish over a few months.