While im here, your problems is quite a familiar situation. for yes, do follow Mike suggestion and I believe that you would need to upgrade your water currents for are you having a PH problem right now? If yes, do buffer your Ph very little each day to maintain it to the level of your desire.
Also if what is happening in your tank, you will have a slight nitrate problem along with the PH for what is happening I believe if that your LR is dying and is making a white power substance all over you LR.
So if my explanation is all correct to your situation, you will need to follow these instruction to the letter and not forget to add currents and not be so aggressive at it. And I forget this that you should do some water changes.