hi djm761, chkd my pH, its gone down even more (i think). the lowest number on my chart is 6.0 which is a dark yellow. not sure what mine is now; it's a very light yellow. what is that? yes, my water comes from a hot water heater. why you ask? the pH for my tap is 7.6. as for my nitrate, it's now btwn 40-80; looks closer to 40.
happy to say my Rainbow is doing fine today. back to his normal self. happy about that. only concern, the problem with his mouth has cleared up; the red spot on body is still there. hoping it goes away. it did before.