NEED HELP AGAIN!!! So a quick update, I will post test results tomorrow but all have been much better, with a small spike in nitrite, up to 1 from 0, ammonia was almost 0 and nitrates still 0. Will do another test tomorrow to be sure, BUT!!!! One of my fish, the one who only eats snails, isn't growing any larger at all, still very small and very thin. He eats until he has a little belly but isn't growing at all. Another fish was acting skidish for a few weeks, running from my hand instead of observing it like the rest do, and tonight when I came home for lunch, he was at the top of the tank, like he was bobbing for air, which wouldn't make any sense because we have two oxygen bubble makers in the tank, and when I reached my hand in to check and see if he was dead, he started swimming away, but shortly after, began spiraling while swimming and one time even became straight up and down in the tank. Only for a second but long enough to really scare me. I don't know what to do about it or what to check for, please help! I don't notice any colour difference other than he looks a little darker than usual, but the way he is acting is now scaring me.