My tank is a 125 with the tankmates in my sig. I've shut off my bubble bar and took out the air-diffuser from the power-heads. Seems the power-heads still put out a fine, fine mist of air bubbles - how can this be if they are submerged? Also there is a fair amount of particulate matter floating around at all times. I'm running a Rena Filstar XP3 and have two Penguin 1140 phs with sponges on the intake grates. The clearest tanks I've ever seen are running UGFs. If you've got a really clear tank, let us all know what hardware you are using and/or what your secret is please.