Hi i was just wondering what is a safe range for general and carbonate hardness? I have mollies and guppies and 1 cory cat in a 30 gal. The carbonate hardness is showing around 80. The general hardness is showing 60. Is this ok? I dont really understand all about the GH and KH. Could you explain in simple terms? I have read some about it but dont understand it. Also what would the GH and KH need to be in a blood parrot tank? Thank you and have a nice day!