Hey guys, so last year I ran 2 tanks. (20 and 15 gallon) and i was given a 30 gallon last week. My tank is empty and going through the bacteria growth and is looking good but I have a question. The last two tanks I had both ended up getting ruined because in literally one day my PH and hardness completely dropped. My PH and Hardness went from perfect to SUPER LOW in 24 hours. I have tablets I add weekly to deal with PH but I was wondering how I could prevent this. Also how do I keep the hardness up and stop it from dropping? Thanks a lot!