ETA: Ah! I know why you have lower nitrates than I do...You have no chloramines and therefore no ammonia in your source water!
Ah well...10-20ppm nitrate by the end of the week is fine with me and probably fine with my fish, however, 5 would bring much more piece of mind /:
Thanks for admiring my fish, fff. Not many members liked him in the photo contests.
Actually, he's a "Copper," three translucent layers of color. Depending on the light intensity and angle, he can look copper-tarnish green, dull blue or (mostly) copper-penny brown. But he's so shiny I can't get a good picture of this color mode. He's a 4-ray HMPK and proud of it.
The light blue HM in my album was my dragon-scale---a devil-dragon because of his red fins. Some people consider dragons as only white. Some include light blue as dragons.