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Originally Posted by danny zubot
About those bubbles; I use a very course filter sponge in my sump, soo course that it will never clog with waste. It only serves to keep junk out of my pump but I have notices it traps tiny bubbles on it. What happens is that it collect small bubbles that will eventually grow bigger and bigger until they dettach and rise to the surface. Give it some thought, it works for me, and its cheep.
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filterfloss works great too for bubble reduction, but needs regular replacing.