One week cycle?

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haha I have a snail tank as well. i only have the one DP though . I am getting 4 otos for him and I could try to get himn a buddy but they say that they get aggressive and territorial when they get older
 
I know bio-wheels turn brown after they are... filled with bacteria. I'm unsure whether this is the actual bacteria or if it is a byproduct of running tankwater through it. I'd imagine that brown "mulm" might be decomposing organics along with the bacteria, but I'm not sure.
 
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