I totally disagree with the posts here.
It isnt hard to raise the ph and keep it stable, its just lazy not to.
These fish need a high ph with hard water for long term health and happiness.
You really should take the postsbefore me with a pinch of salt, I dont know why but this forum gives some awful advice.
If your tap water is a ph7, then to raise it to a ph 8.2 is really simple.
The best way to do it, is to use bicarb. of soda, and epsom salt.
The bicarb raises the ph, and the epsom salts buffer it, so keeping it stable.
To raise the ph of your water, add 1 teaspoon of bicarb and 1 teaspoon of epsom salt to 20litres of TREATED tap water before you put it in the tank.
It is completely safe and a well tested method.
I have done this for my malawis for years now mate.
Oh, and dont worry, even if you put in a whole tub og bicarb, it wont raise your water above 8.4, so dont think you will over dose, because you cant.
Good luck.