Sorry should have states those in my post..
Ammonia 0
Nitrite 0
Nitrate around 20ppm
PH 7.4
Tank size 20 gal
I had them about 3 months - I feed a variety of foods: NLS small pellets, bug bites tropical flakes, freeze dried daphnia, Hikari sinking wafers, Hikari algae wafers, vibra bites and...