Hello, fellow fish(wo)men! So, I have a ph-controller. Right now my ph-level is set for 7.0-7.10. My KH is 3,5 I realised that my C02 PPM level, with these measurements, is way too low for my plants and thus would like to lower my ph-levels to 6.7-6.8 to get closer to the preferred ppm. I have 11 zebra danios and a super red pleco ( <3 ). Will this kill them if I lower it to these levels? (sure it will be done gradually). Aquarium is 180L (48Gallons). Thank you!