Bio balls work the best when they are not submerged. You are looking for a dark, moist, high oxygen place with alot of surface area for your bacteria to process the ammonia and nitrite. Hope this helps you in the design of your wet/dry. Mike
Thank you guys for you info pertaining to my question. Thats what i thought, but it had been so long since i had used a wet dry i just wanted to make sure. Thanks again