Pangasius catfish Q's

ph is high acording to the drops. the dip strips always read about 7.0-7.2 but the drops are saying around 7.8. I've tried ph down but it never seems to make a difference? I always used to just add tap water to the tank before, in the 180 ill be testing and adjusting the water first (granted I can acclimate them back to proper ph...)
 
I wouldn't worry about the ph at all. As long as it is stable then you don't need to worry about it.
 
Since you lost few new additions, appropriate/ideal water for new tank would be way to approach if possible, especially if you intend to add few new ones.

As you have experienced, because one adjusted to extremes does not necessarilly mean it's cousins can.

afa fish adapting to any pH, it's idiotic statements as it all depends on each species desired/required condition and each individual's physical condition at the time of acclimation. Not everyone can compete in marathon/triathlon.
For example, try acclimating wild dwarf cichlid, crenicara, in 7.8 water. one or two may survive (a miracle i call it) but majority of them would not survive. I even lost close to whole batch due to drastic changes caused by massive water changes , even with well prepared/aged water as there are other criteria majority of hobbyists cant test for at home. Thus always recommend small and frequent wc changes over one massive ones.

There is so called ideal conditions where majority of each species would adapt to and thrive, not just one or two.. Therefore, why not take an extra steps/efforts which will reward keepers abundantly rather than heartaches.
Keep guppies at stable pH of 6. Wonder how well they adapt?????
Since many says it is hardness that is important, someone can make hard water but keep the stable pH of 6. Not easy thing to accomplish at home. When prepared, Stick group of guppies in there and see how well they do???? Ive done such on numerous occassions and guess what? Most didnt survive and death followed shortly after and some succumb to diseases before death..

If memory serves, Most pH down products contain phosphate which will increase/promote algae growth and it does not work permanently, if at all. Perhaps just temporary drop with adequate amt.

As you have successfully kept one at present condition & provided Billy and new mates survived new tank in ideal conditions, you may let new ones gradually acclimate to present conditions if you wish with hope they all adapt.

I am sure there will be someone who will say it is hardness which will kill fish, not the pH. pH has sort of acute effects (hours - days) and hardness has long term effect (weeks -months) but varied upon other variables.

Understand fish anatomy and how/where ion exchanges take place and what effects it has on its renal/excretory/circulatory functions, etc. etc., it is SO simple to comprehend.

Provided your water is alkaline and hard, you may not need to drop much to reach acceptale range.
Look into rechargeable water softener as RO/Di can be very expensive to run in replacement parts and high water bill if you have water meter.

Good Luck with new tank!
 
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