I've been planning to set up a 75 gallon Lake Tanganyika community tank. But am concerned that my water parameters are not appropriate. pH 7.4 - 7.6. kH 4 GH 9. From what I've read on this site chasing pH is not a good idea. From what I've been reading aragonite or crushed coral won't make much of a difference with raising the pH. Has anyone used crushed coral or aragonite in a fluidized filter to raise pH. I don't want to invest several hundred dollars in fish that wound not thrive or worse not survive. Are my concerns legit?