hey Jess. Carlos pretty much covered the basics, but you never said what the pH reading was. are you in the city? or the suburbs? my pH in the city ranges between 6.4-7.0 depending on the season. also, what kind of filter?
i agree with carlos to never use chemicals to modify water parameters. to soften water, you can add peat to the filter. it does an excellent job softening water and lowering the pH.
as far as the bubbles go, can you take a pic of the tank and the bubbles? normally, if the bubbles are darker brown with black specks in it, it is from missed particles in the substrate.





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