why's my pH so low??

[fishface]

- haven't added any supplements
- pH reading via caliberated pH meter
- and yah, my plan was to go get a salifert Ca test kit today cause that is what i think is with my Ca issue.

so perhaps i should do a fairly substatial water change you figure? how much is that? with my planted tank i do weekly large (50%---60%) but i would think that would be too much for this tank huh? so 20-30%? what do you guys think?

also, thanks for the input!

darryl
ps do you use a kh kit for testing alkalinity?