Will am guard harm my beneficial bacteria in my filter? Have a small ammonia issue and I've cleaned my gravel and filter media and did a large water change and there is still a small amount of ammonia. Ammonia is .25ppm, ph is 7.5, nitrate is could be 5 but looks even paler, nitrite barley has any color but there is a very slight slight purple I'm not sure if it's .1 ( its quite a bit lighter than the first shade on my test) or just slightly colored from the drops being added only. So can I add am guard, I tried prime but it didn't do anything when normally it fixes the issue completely.