Thanks; the only reason I placed it where I did was because I had assumed it was the best layer to have before the water hits the Biomax. As it stands, my layering is like this:Using floss is ok in a media basket, personally I prefer to have it hit there last rather than in the middle of a sandwich. It's least likely to be needed there, so will give all media chance to be used first. But just rinse and reuse or replace when needed.
Sponge (on bottom)
Floss (in middle)
Biomax (on top)
Thanks again; I'll try the prefilter tomorrow, and see if that does anything....I'll let ya know.The noise you can hear is likely because of the impeller being surrounded by air from the bubbles, once there is enough air the impeller is ineffective, moves far less water, and leaves the filter less effective. The less air you have going into the filter increases the likelihood that it won't just travel through with the water.
You are likely to have better luck, if you don't move the bubbles away from the intake, to invert a cone under the filter intake which will maybe redirect the bubbles away.