Nifty point Don..........we sometimes get so carried away with talkng about the extrems of fish keeping that we don't talk about "normal" things. A TDS of 34 ppm is a great all around hardness for probably 99% of the apisto's of the world ....and other softwater fish too..........yes the pH will bounce and people are findng out that pH in no where near as important as hardness....but a suggestion....if you have a particular fish whose spawns just don't seem to want to hatch even if the hardness is OK then the pH might be a factor in that fish's make-up............ for the longest time T. candidi (Apistogramma??) was that way.....when the wild fish were coming in they would spawn but there was no hatching of the eggs until the aquarist lowered the pH (<6.0)along with the hardness.........each fish is different!.....the hunt becomes finding the conditions that each fish likes...then they will spawn......gus these are animals and they WANT to spawn, it's their purpose for existancebut their body wil only "turn on" with some certian set of circumstances or conditions....and sometimes a fish of the same species requires different conditions depending on it's ancestry.....an aggie from Lake Tefe need different things from an aggie from the Rio Negro.......that for me has been the fun part of keeping fish for the last 7-8-9 years! You guys shouldn't have pushed my button today......I get rolling on this stuff and you can't shut me up.....;-) Mike P.S. Hey Don...........have you heard from Kent Sahr lately.......it's like he droped off the face of the earth!!!!!????? > Well, I guess I will put my 2 cents worth in too. Where I keep my Ro water > the temperature is only around 72F. but the fish room is 79F. So what I do is > add 120F water from my hot water tank until it reaches the desired > temperature. I have been doing this for about 10 years now and depending on > how new the RO unit is and how much hot tap water is needed, I end up with a > TDS reading of about 34 ppm which works well for me. My tap water starts at > 175ppm with a 7.5pH. I have a pH meter somewhere but don't use it very much > as I don't like trying to change it as it still fluctuates so much anyway. I > do end up with a 6.0pH most of the time (when I check). Now I know there are > many ideas on how to change water conditions and I figure whatever works for > each person is correct. > Don > ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com.