Ihave the same situation with a black belt....but he doesnt touch the powerhead .....just hob intakeThe only problem I can see with using a powerhead on sponges is my big jag. He won't leave intake tubes on his filters now. How do I keep him from messing with powerheads? When I do move a filter, I am going to start siliconing the intake tube on. I'll see if he can take those off! I also am thinking I may have to silicone the sponge bases onto a rock or something to keep jag from knocking them over. I can see the sponges as an inexpensive backup and just a little extra filtration. No such thing as too much filtration.