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Nitrates are at 20ppm, nitrites are at 0.5ppm... I added Bio-Spira on Saturday evening, after putting the sand in.

It was clearer this morning, but I had to move some sand and plants around, which...

So, I've changed the substrate to sand. It looks great, but my water's not as clear as it was before. Before putting in the sand, I rinsed and rinsed and rinsed... apparently it wasn't enough.
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Hey there,

I've set up a freshwater aquarium in my office, and I'm wondering what fish to add. It's only a 16 gallon, so I can't have anything too big, obviously.

I'm not married to the idea of...