My ph is testing at 7.6, however this is the highest this test kit goes. I am going to get a high range test tommorrow to be sure. My big tank is a steady 7.0 and I can't figure out why there is a difference

Only thing I can think of is the sand substrate or because the tank is not as mature as my big one.
When I look at this tank, I picture a pretty Angel with the wood and live plants. It is 30 x 12 x 18 inches, so maybe a possibility for one Angel with a school of colorful dithers ?
I'm thinking this may be the route as I do not want to do any breeding. What do you all think ?
Here is the tank. The plants are taller now and I have ordered a moss ball, foreground plants, and some floating plants. I know a family owned store here that has some healthy Angels that are acclimated to our city high ph water.