I recently started my first planted tank in a 40 g breeder. I have been attempting to cycle for over 2 months now. My plants are doing great and growing like crazy but my PH has been steadily dropping since I started Injecting Co2 for about 8 hours a day at 1-2 bubbles per a second. My PH sits at about 6.2 and 6.4 now. I otherwise would be fine with this since my plants are doing well but it’s making it impossible to cycle. I do 25% water changes 2-3 times a week. I have also added crushed coral to my Aquaclear 50 filter instead of carbon to hopefully bring up PH. Any other recommendations? I add Prime after every water change and initially started the tank with Tetra safe start and Microbe lift. I have a few Molly’s in the tank that I added before I started injecting Co2 when my tank was showing signs of finishing the cycle before my PH dropped. After Co2 I have not seen a single nitrite or nitrate. I test daily using the API test kit and make sure the ammonia never goes above 0.5. and the Mollies are thriving. Any advice would really help!