Lance's 225 gal tank

[Greenmaster]

Originally Posted by Lance

Yup. But I feed a lot and if I don't do a 10% water change every 2nd week the nitrates would start to climb. Not sure what happened here but I'm going to try reducing water changes to monthly and see how it goes.

It could be that because the denitrifying bacteria only replicates once every 5-10 hours that it takes a few weeks for them to catch up to your demand, but now that it's there it should be okay.