ph dropping

Hello, I’m very new to the hobby and it was an emergency rehoming situation to which I obtained the fish. Long story short, I have the fish in a 54 litre but I am currently cycling a 105 litre for them. The 54 litre with the fish is currently cycling too The problem is my pH levels are not...

Hey all, We're beginning to run into a new problem. Over the past several weeks our ph has been slowly dropping, to where now it's about 6.8. A few weeks ago it was holding steady at about 7.6-7.8. I know that our fish prefer the lower ph so it isn't an issue at the moment, but we don't know...