I get this kind of bacteria growth when I over do it with the vinegar in kalkwasser.
It only shows up in the grow tank (no fish). I vacuum it off along with the snail poops.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement  ,reefing since 93,SPS since 99.
TOTM June 2010
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