Newly cycled tank, only 3 mollies for now to support the ecosystem, all the plants are new as well, got them from a local grower, Ive been at straight 8.2 for weeks now.

Ignore that beginning dip, pretty sure that was a mistake on my part, but after off gassing, I’m 8.2 out of the tap. This is all pea gravel so I should have a pretty good buffer, but I just can’t figure out why I lost .4

Any ideas?