Sponges and bio wheels can become nitrate factories if not cleaned on a regular basis. Plus dead algae on a clip will produce nitrate. I would not leave this in the water.
How did you replace the bio wheel with lr
. Bio wheels are driven by water current or spray heads.
The reason for putting lr
in a canister or overflow filter is to provide a place for beneficial bacteria to grow.
There are other ways to reduce nitrates like dsb
and refugiums, also lr
which you already have.
Hopefully this will help,
I was in the same boat that you are in once, could not get my nitrates below 20. So i updated my equipment put in a 4 to 5 inch dsb
, added a refugium with macro algae, and installed a remora pro protein skimmer.
Now my nitrates are 0 to 5.
that just my 2 cents.