Before anyone yells, I had a 20 gallon tank cycling. My husband doesn't know anything about fish. While I was visiting my mom for mother's day, he emptied the whole tank, cleaned everything(including the gravel), filled the tank back up, put everything back in and treated the water. This was on Friday. The temp was right on Saturday, so off to the fish store he went. The lady at there told him the tank was ready for fish since it had been 24 hours. (I'll be calling her tomorrow when they're open.) So she gave him one baby oscar and one an inch-by their scale. You can imagine how I felt when he told me everything he did. :mad2: Is it possible to save these oscars through the fishy cycle? I have a 10 gallon-stabilized, but I have fish in it, so that's out of the question. The ammonia was .5ppm and the nitrites were .5ppm. After a 50% water change, the ammonia is the same, but the nitrite is .25ppm. Should I keep doing water changes and vacuuming through the cycle? ANY help is GREATLY appreciated!!! I'm a newbie myself and my husband obviously knows nothing about this hobby!!!