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So I have a 5 gal tank that went through a fishless cycle last month, and after a week of testing consistently no nitrites or ammonia and little nitrates, where I thought it should be, I added fish, 6 ember tetras, two rcs and a nerite snail. I added them sunday, and noticed this morning the fish were acting kind of erratic, darting around and more 'clumsy' knocking into things etc which I thought was weird so I tested nitrites, ammonia and pH. I did this yesterday/last night too and they were fine, there was a little bit of ammonia, less than .25 but more than 0 but I didn't find it overly concerning. Today though ammonia was still 0 and .25 but nitrites were close to .5. I did a water change and they're down to .25 but it's still scary, what do you think happened and can I fix it? Is there anythings I can do to reduce nitrites except water changes? The fish are darting around now chasing each other and not schooling which is a change from yesterday but they don't seem to be knocking into things anymore at least