Please help!! Just gone to my tank and the Xenia was flopped over - did a quick test and the PH has dropped to 6.8!!!
How has this happened and what should I do. LFS is closed till tomorrow so I can't buy any new water. Will everything be OK til then. I just don't understand it - does anyone know. I'm in a right old panic now.
I should add that all other paramaters are fine - I'm only using one of those silly strips for the PH levels but they are in balance with the dKH - i.e very low as well. @Its a 55gal with loads of LR and a skimmer. I'm gonna add Kalk now, never really use it but its in the cupboard and I'm desperately worried as I'm off to work in half an hour.

I should add that all other paramaters are fine - I'm only using one of those silly strips for the PH levels but they are in balance with the dKH - i.e very low as well. @Its a 55gal with loads of LR and a skimmer. I'm gonna add Kalk now, never really use it but its in the cupboard and I'm desperately worried as I'm off to work in half an hour.