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.
However, if you choose the wrong kind of rock, you may be risking the health of your aquarium. If you just pick out a random rock in your backyard, there is a high chance that they alter the water parameters of your aquarium. Some rocks can change the pH and hardness level of the water. If you try to maintain a constant pH on your water, you will find that some rocks can change it dramatically. Another thing that you need to watch out for is the growth for bacteria. Some rocks may harbor a host of bacteria which can easily thrive inside an aquarium.