Your right sorry other way round for nitrite and nitrate.
Ive got a little group of 10 ember tetras and 2 snails, quite a few cherry reds (no idea how many now) and 5-6 remainig crystal blacks.
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Potato phone pic, hopefully you get an idea of my setup
Is that a fluval spec?
If it is, just pondering why you have an external filter on it.