Hi, I have a 2.5 with a single betta and possibly a really small pond snail. I say possibly because I saw him yesterday but I haven't seen him today. I have been keeping an eye on my water params very closely due to my betta having developed fin rot. In my tank I have live plants and a sponge filter. Nitrites, Nitrates, and Ammonia all test 0 (finally!) usually my water tests alkaline 7.8. Now it's testing 6.2! The last time it did this I ended up having lost my mystery snail and my moss ball! I don't know how to lower the acid without completely tearing it apart... Which I'm afraid will ruin my cycle!