How long has the biowheel been running and was it in conjunction with the old filter?
You could have 'seeded' the biowheel with some existing filter material...
As this is an established tank I don't think gravel from one of your other set-ups would make much difference
I would also cut right down on feeding untill you can get these nitrite levels down to lessen the load on the biological filtration....
You could have 'seeded' the biowheel with some existing filter material...
As this is an established tank I don't think gravel from one of your other set-ups would make much difference
I would also cut right down on feeding untill you can get these nitrite levels down to lessen the load on the biological filtration....