Your pH Question
Good morning Mumma...
A pH of 7.5 is on the alkaline side. Most marine fish prefer this type of water. A pH of 8.5 isn't too high. If you're an "old school" fishkeeper like me, this information is a little over my head.
I have several large tanks of Fancy Guppies and can tell you these little guys are very tolerant of water conditions in general as long as the water is changed frequently. I typically change a minimum of 50 percent of the water every three weeks and the fish and plants do very well.
pH is really unimportant to Guppies as long as the level remains constant.
If you have any other questions, please let me know.
B