i have a malawi cichlid tank. my tap water is soft and has a low ph. i've been experimenting with a diy buffer recipe (baking soda, epsom salt and non-iodized table salt). my gh is good now (16) but by the time i added enough baking soda to get my ph up to (8.4), it made my kh (27). from what i've read, that's WAY too high. is it bad for the fish? if so, how can i lower the kh without bringing the ph back down too?