Keep in mind that a true DSB
is over 6in. This will give the bacteria the anaerobic environment it needs to grow. For myself, I use a 3ish inch sand bed with lost of LR
for my main filtration. A more shallow sand bed will certainly help with the accumulation of NO3
, but will not be as effective in breaking down of NO3
also come with a warning...they can trap toxic gas pockets that, when released, will foul water.