i have a powerhead in the tank but it is at the top, where the standard nano cube pumps are. i have a little air pump that i use for mixing saltwater, so should i use that to point at the sandbed? i keep checking my params and they are still stable so i know the tank is cycled. and rebel i dont have fish in there right now. prob wont for about a month cause i am going to quarantine them in a seperate tank(which is still cycling)