Yeah, you probably could. I wonder if there is a need for it though. Do you have live rock in this tank? If so, the LR
will, after cycling is complete, take care of the ammonia and nitrite. If you do not have the LR
, you will be relying on the sponge for a biological filter. If this is the case, it might be a good idea to have two in there. That way you can alternate cleaning them and this will have a lower impact on the biological filter. Tell us more about your tank. What size is it? What will you be keeping in there?