Hello everyone. I’m new to the forum. I apologize if I post in the wrong area or anything. I am currently in a dire situation with my red tail shark. My tank is 29 gallons Ammonia - 0 Nitrites - 0 Nitrates - 0 PH - working on Temperature 76°F 4 Black Skirt Tetra 1 Red Tetra 1 Red Tail Shark 1 Rainbow Cory So I received some fish from a friend of mine because his tank had broken. So I purchased a 29 gallon tank and gladly took his fish, and everything else he had. Tank is cycled nicely thanks to using the canister filter he had, and gravel, plus 10 gallons of his water. So as far as I know it’s cycled properly and my water parameters have been doing well. I’ve had to keep an eye on ammonia levels but water changes have helped. Now on to the problem. This evening I noticed my BTS swimming absolutely insanely. He was swimming max speed doing backflips, and swimming on his side when he wasn’t doing that. So of course I tested my water. Well while testing, all levels were great, except my Ph crashed down to 6.0!!!! So my first instinct was to gradually increase the Ph. So far I’ve gotten the PH up to 6.6 but I am trying to be very careful and take my time raising it, so I don’t shock or accidentally kill any of the fish. So now here is the current issue. If I continue slowly raising the Ph I fear the shark will surly die. He’s no longer doing flips and swimming max speed. Now he’s just sitting at the bottom of the tank, barely moving, floating slightly on his side, and opening and closing his mouth a lot. I am also not sure but he also seems a little more pale than before I got him. I haven’t even had him for a week so I’m not certain. Anyhow I just really need advice. I will do anything to keep this shark alive. If you need any additional information please ask me and I’ll respond right away. I won’t be sleeping until he’s better.