[Mugster]

Hi everyone. I seem to be having a problem getting my PH up to the 8.2 - 8.4 range. It seems to hover around 8.0 - 8.2, at night dropping as low as 7.8. I use RO water. I've tried using buffer but it still won't rise. I drip Kalk on a daily basis as part of the top-up. All of my param's are fine except the PH. Can anyone offer some insight as to why my PH is so low?

Thanks.