Water Flow Questions

[Acipenser]

For water flow in my 26G bow front I have a Koralia nano 425 on the left side near the bottom directed into the LR on the right side near the top I have an AC30 power head the water is deflected to the surface it is dialed back to it's lowest setting.

I was thinking of pulling the AC30 out and buying a second Koralia nano 425 and putting it on near where the AC30 is. Is this enough flow what is the recommended position and number of power heads for a 26G nano tank ? I have 1 leather coral and plan on adding a green toad stool and probably a colt.