Is My Gh Kh To Low For South Africans

[malawilover22]

hi, new to the site i have a 125 gallon mbuna tank thats been running for 9 months my ph is 7.8 gh is 5 kh is 7 the strange thing is even with a low kh my ph never changes has been the same for 9 months is the same out of tap, im not very concerened about ph as all my fish are farm or tank raised. but i am wondering if low gh or low kh will harm the fish health,wondering if i need to try and raise them or if im worrying about nothing. i added some aragonite substrate and have coral in my filters since ive brought up the gh and kh by two points over the last week the fish seem to have become alot more active and seem happier just wondering if i need to go higher just concerened about fish health any help is apreciated thank you all.



gene sorry posted in wrong place again hope someone can move to right place thank you!