Aqua Man
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I dont think so... I have seen more than my share of bacteria and algae/diatoms in my life which is what you had. The dust would be grainy and settle on the bottom not slimy and grow on tubing etc.Well maybe I dropped the ball there but had thought if the water was clear I was good to go.
Which is completely normal btw and a good thing. This is why we clean between grows.