your specs are confusing, you should probably clear it up a little.
i'm guessing you specs are..
with 112watts with 4 light, 2 are actinic and 2 are 5/50??
well the 2 actinic are useless, so don't even bother and as for the other lights i really don' know what 5/50 means so my guess is you might just barely have enough light. what's the dept of the tank?
as for the plants you listed, they're pretty easy to take care of so you won't need to dose but a good subtract will always help. The regular gravel probably won't be sufficient because you have a lot plants that are root feeders, if you're looking for cheap look up Turface Mvp or Soil Master Select.
Turface Mvp sent me a 50lbs bag for a sample, i didn't pay shipping either.