Today I got my ph checker...

And I got:

Soil = 6,2
Rain water = 6,0
Tap water = 8,0
Rain water (1liter) with 3 ml fishmix = 5,8

:wtf: So it shouldn't be a problem with my ph.

I just will raise the ph now to 6,2 by adding a little bit of my tap water.
Is that a good idea? Or what else should I add to get them more healthy?
I still have some Guano(NPK 6-4-5) here, but it is an organic/minerally fertilizer. I don't know if Guano will be good together with fish mix(NPK 6-2-4)?

xoxo