In my experience, co2 or not you get crazy root growth when potting soil is involved. Only con: The mess you get if you move stuff in your tank a lot. (I do that)
Oh, and be super careful with the paintball co2. The diy is very tricky. I tried it, then spent $200 for a regular setup.
Fluval Flora Pimp #34, 40b Congo Puffer Tank,
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