hmmm, what does the debris look like? There has to be a source...
isn't going to do much to fix the issue. The intake on an HOB
is under the water, not on the surface. If you are looking for a way to get rid of the debris, you would have to have some sort of skimmer... but that shouldn't be necessary. Your best bet is to try to figure out what it is coming from and eliminate it. My guess is it is stuff from the substrate, being a new tank. Did you rinse the substrate well before adding it to the tank? What kind of substrate is it? What else is in the tank?