I just bought a 29 gallon tank. Waited a few days for it to get to temp and then added 3 tetras. I had added the beginning water conditioner/PH down and checked the water using a test kit. I am using flake food and it seems they don't eat everything(I am giving them small amounts but will lessen it even more) I do see pieces go down to the bottom. I have done a couple of tests and working on getting my PH down and it has no signs of ammonia or nitrates/nitrites. It has only been a few days and I am worried about a spike in ammonia..should I be worried? I did add some healthy bacteria to the tank with the nitrite bacteria. I am not totally understanding the whole biological cycle. I guess wondering how many times a week should I be testing my water? and how often should I change the filter? I use a filter system that is not inside the tank but sucks water up and pushes it through the filter then goes back into the water..I just want to understand and keep my fish safe with the eventual adding for more fish