Is this considered a c02 reactor or?

[R.sok]

Due to small space (8 gallon biocube) I've decided to remove the nano powerhead that had my c02 line hooked into the input, it was just simply a little too strong.

Trying to think of other methods I've decided to hook a tubing to the outlet of my wet/dry filter, drill holes all around it, mainly pushing foward & take the c02 line with a chopstick at the end of it & jam it inside the lower tubing, so the tiny bubbles move up then out the holes. Is this considered a reactor or? Do any of you believe it would be adequate enough at the way it's set up now? It has some big bubbles go up but some tiny bubbles do somewhat go around the tank.

-Lighting is a 15 watt 6500k cfl with a clip on desk lamp.
-Dosing seachem comprehensive 1 line in the cap every other day
-12 hour lights
-three pea puffers
-anubias
-rotala indica
-water sprite
-water wisteria
-java moss
-Just pool filter sand substrate
-havent done a water change in 3 weeks just topped it off, maybe I should do them?

here is a picture of what I'm talking about

[R.sok]