Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
I also wonder if it might not be from new substrate that might not have been rinsed ,or dirted tank.
I would not be inclined to clean filter's that were moved over especially the biowheel's.
Would let the filter's run as they are a couple week's before cleaning one ,and then the other one the following week.
Water changes whether there are fish or not,once or twice a week ain't gonna hurt nothing.
Number's for water parameter's are much more revealing than description's/opinion's like good,normal,great,spot on,etc.