Well my tap water comes out at 8.0pH, 5gH, 3kH, ~72-76 TDS (TDS according to water report)...
I was gonna make my 5.5g a Sulawesi tank for my cute little Malawa... but the water is 6.6pH, 5gH, and 3kH. Right now it has my unknown shrimp, a male RCS, and a couple guppies that I kept and some pest snails.
How did that pH happen... I can only think of two things. And I tested the tank water 3x to make sure I wasn't making mistake or hallucinating.
I got impatient and really wanted to try the Root Medic Complete+ Root Tabs so I stuck them in this tanks substrate since I had already gotten the Seachem stuff and already put it in my 10g couple weeks prior to over_stocked sending me an awesome sample of his Complete+. The tabs are gonna be perfect for my 10g though as soon as the seachem tabs are done and I move my Malawa!
Either that or the Nutrafin CO2 Canister thingy? It sucks though, so I couldn't imagine it doing that much of a pH drop! O_O
So I have some crushed coral in a small tub with tap water. And I have no clue what the pH in that tub, since the test came out reddish or magenta-ish, and there is none of that color in the API high range pH, so I'm assuming it made the pH higher than 8.8?
Tldr; how many spoonfuls of crushed coral to put in filter bag to bring pH back to 8.0-8.5pH?