Hi, i hope you guys can help me figure out what is wrong with my tank. I have a 45 gal tall tank. so 12 inches wide, 36 inches in length and i believe 18inches tall. It is not a planted tank. i have an airstone and a 50 gal sponge filter to which i added an airstone to this filter, plus a 5 gal sponge filter as well. I tried to cycle my tank and i tested my water once a week and noticed that the ammonia spike did drop but nitrite and nitrates never appeared. this was the case for 3 weeks. i was tired of ghost feeding the tank because the decaying food would just collected at the bottom of my tank so i bought dr.tim's ammonia and started dosing this daily to get the ammonia level to 2. I also purchase 2 bottles of fritzzyme 7 hoping that this live bacteria will help the nitrogen cycle. this did nothing and i continued adding the live bacteria until both bottles were empty. at this point ammonia, nitrite, and nitrates were all 0. I did more research and a youtuber stated that my tank may have been cycled and i just have "really clean water". so i took my tank water to a fish store and he also confirmed my tank was cycled. So the next three weeks i started buying fish only for them to all die within weeks of each other(i only bought 3 glofish tetra each week). I then bought fritz turbo start and this seemed to help for a week, ammonia dropped but again, nitrites never appeared. 2 weeks after dosing fritz turbo start, i now have an ammonia spike of .50ppm. I once again purchased another bottle of fritzzyme 7 hoping this live bacteria can help cycle my tank but again, nothing is happening. I did more research and the internet stated that if my PH is below 6, the cycle will cease to exist. these test strips and master test kits only show a ph level of 6, so what if my PH level is below 6? how is it even possible for a tank to cycle with such a low PH level? if beneficial bacteria prefers PH levels of 7, how are people keeping fish like German Blue rams who prefer PH levels of 5? any suggestions would be great. this is the third time i'm trying to cycle this tank and none of my friends keep fish, and the ones who do are pretty much useless as they have people who set up there tank and maintain the tanks for them.