No problem. I just wanted to make sure the answers you got actually peratined to your situation. These question usually come from people with either brand new tanks or people who have comepletely switched out their filter and are mini-cycling.
So, now on to your issue. If there are particulates in the water, the lights will accentuate it, but it shouldn't be there in the first place. Do you have the polishing pad in the fluval as the very last thing the water goes through?
Another possibility is that somehow a tiny bit of air is getting into the canister and is being blown out a microbubbles. These bubbles can get caught in the currents, and nerver make it to the surface, or are gassing off at the same rate they are being put into the water column by the filter. A third (but more remote possibility) is that the output from the canister is disturbing the substrate (you didn't mention what you have for substrate) just enough for any tiny particles to become suspended.
Oyther tahn taht, I am at a loss.
