flourish trace would work if you want to make it easy. You could also look at something like leafzone from API... this is a trace/potassium mix, which would be fine for a lower tech setup.
I agree with WhiteDevil... tie the plants yourself. You will save a lot of money, and it isn't difficult.
Dwarf sag can be picky... but I think it could be tried in a medium light tank. Have seen folks have success with it in low tech tanks.
Running air in the tank during the day is just fine if you are not injecting CO2
. In fact, it will help replenish CO2
so that the water remains at equilibrium with the air. The only time it is bad to run air in a planted tank is if you are injecting CO2
into the water... by running air, it off-gases the extra co2
that you are trying to inject.