First, my parameters:
38 Gallon.
Been cycled for 2 or 3 weeks.
Water test this morning showed 0 ammonia, 0 nitrite, and 30ish nitrate.
My tap water has 10 nitrate, today was water change day.
I have 8 neon tetras, 6 (5 if this goes south) spotted corys, 6 long fin zebra danios, 10 ghost shrimp...