I've been struggling with low PH. I started dosing with aquos ph 8.4 it says it may take a week to stabilize. Tanks seems to hover just above 8.1 during the day and lights on. night is usually 7.9, however tonight (it's 1am now) it realing heading down. Went down to 7.8 then to 7.7. I started to get worried so added some ph 8.4 liquid which for a while took it to 7.92 and now 30mins later it's back to 7.81 and seems to be slowly dropping. What is the dangerzone for low PH? I'm too tired to stay up much later and am worried if it is crashing then i'll wake up to a dead tank I'll stay up for 30more mins and see if it maintains 7.8