Tested my water ~18 hrs after first fish. All numbers 0, though the ammonia colour could conceivably be described as non-zero, but the colour was way closer to the zero than the .25. Interesting (to me) observation: I got 6 Cherries, and 5 seem to hang out together, usually toward one wall, with the other one swimming around everywhere. I fed them a tiny amount and the single ate most of it. The others came over for a quick bite, but went back quickly and the single finished it all off. Also, one of them is noticeably darker red than the others (not the single I mentioned earlier). I'm guessing it' said female and the rest are males?