Okay, its about 22 gallons, ph is 7.4, ammonia, nitrates and nitrites are 0. I have two angel fish, 4 penguin tetras, 7 black phantom tetras, 4 neon tetras, 3 guppies and 2 ottos. The angel fish are small though and i have checked to see if it is overstocked, but i havent added fish for 3 or 4...