So fist, if you don’t know if the tank is cycled or not, then you must assume it’s not until you know. Get an apI master test kit ASAP. I would get some seachem prime and do water changes as frequently as possible (40% every day or every other day is best.). If you don’t understand the nitrogen cycle then read this article (I will link it).Haoahhao said:I do not know the water parameters but I do a 75% water change every week. My tank is around 15 gallon.