I just checked out those filters, very cool. I wish I had gotten those before. I wish i would of known more of all the products and stuff as I started the hobby, would save me money and time and be better for the fish. Do those systems also have a mechanical stage to them? This is a stupid question. I use the API test kit, now when I test the nitrates (this is always tricky because there are a lot of shades of red), do I hold the tube of water in in front of the card or should the tube be touching the card. I noticed, when the tube is touching the card, it's a different color (which represents a different ppm reading, which is important) as oppose to the tube not touching the card, but being very close to the card. Thank you.