Hi, I'm kinda a newbie, but kinda not. Anyway, have kept a single "kissing" gurami for years. Recently added more fish. So my tank is basically having to start a cycle over again. My last readings were ph-6.0, ammonia-0.50, nitrite-0, nitrate-40. That is an improvement. But, why is my nitrites 0? Is that good or bad? According to posts on forum I shouldn't use ammo-carb. So, do I just need to let it do it's thing? I have snails, isn't the ph too acidic for them? Should I adjust that? Any advice would be appreciated!! Thanks