Originally Posted by the_r0ck

LUSHGro contains a general level of NPK and small amounts of other elements. As you are going low tech you shouldn't be dosing so much. You are already dosing N, P and K in powder form and Seachem Flourish contains some (actually quite low) levels of NPK and a good dose of trace.

I will not recommend ditching it immediately. If I were you I will slowly decrease the dosage over time and see if there are any impacts on the plants. But my guess is that there won't be much.

Here's a good link for Tom Barr's Non-CO2 method:

"http://www.aquaticquotient.com/forum/showthread.php?t=13623"

-Calvin