My tank is a 20 gal, ammonia is still around 8.0ppm, Nitrate - 10, Nitrite - 0, PH - 7.8. I now have 3 small ocellarus clowns, 4 shrimp (CBS, cleaner, fire & pepperment), anomones & snails & crabs. All my water per. were perfect till I put my buddies critters in there temp b/c his tank...