Hi, Below are my setup. And attached plants that I started with. I've started this setup since last Friday.

1) 3ft x 1.5ft x 1.5ft open tank with cabinet
2) 20kg brown gravel(JBJ)
3) Dennerle Deponit Mix 120L
4) 2 sets of 3ft Maqnum II 2 x 36W
5) JEBO external canister filter, 1000L/hr
6) 3L CO2 cylinder with soleniod(2-3bps)
7) NA External CO2 reactor
Surface skimmer
9) All other roots and water fertelizers(Fe, K2SO4, MgSO4*7H2O, Florena)
10) Temperature range at 27 to 28degC

The questions are:

a) Why I don't see any bubbling effect?
b) Are the lights not strong enough? Should I increase to 6x36W?

Please advise.

Regards,
Kevin Lee