Originally Posted by Bluydgrl
What is the best PH to have in my 36 gallon?
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whatever makes the fish happy.
Actually IMHO there is not one value of pH for your tank or anyone elses'.
for instance pH increases with decreasing carbon dioxide. Which would hardly be harmful to any fish.
So a lot depends on what else is happening in the tank with resulting differences in pH and everything else.
In my (what people consider wierd) tank with no mechanical circulation or filtration, I consistantly see a pH of well over 8 with the api high range test kit. Usually peggin that kit at 8.4-8.8. And for both FW and marine and even FW tank with 1" of peat moss under the substrate. Yet with those "extreme" values even fish like neon tetras and hachetfish that are reported as needing ph values of 7 or less, live for years and years.
But those tanks are fully balanced out with plants (FW) and algae (marine) which makes the tank a net sink of carbon dioxide and source of oxygen each 24 hour period. Again, hardly a dangerous or unhealthy environment for any fish.
My concern with your low pH was that the tank was not fully balanced out resulting in high carbon dioxide causing the fish to breath rapidily.
But you tank could be different.
And mine is still only worth at most.