Transcript of Heart Disease and the Excretory System. Heart Disease and the excretory Heart disease slows the oxygen flowing throughout the body. So oxygen moves slower to the excretory system.
The most likely causes of a shift in pH are: 1  Something in the water source buffering the water. 2  Something in the tank buffering the water. 3  or Something you are adding to the tank.
Most aquarium fish are pretty adaptable to pH levels. The real danger is in rapid changes of pH, temperature, etc. One way to gradually lower pH is the installation of real driftwood. Malaysian driftwood is a good choice and is available on EBay and Aquabid.com.orum: 45. Votes: 0. The pH in my Betta tank is about 7.4-7.5 and maybe close to 7.6 Hard to tell exactly with the color chart. I tested today and while all other parameters are zero the pH seems a bit higher than normal (I'd say 7.6).