Hello Sicklidkid,
It just so happens I have all of those plants in a 40g tank with
DIY CO2. I"d suggest about 3
WPG and some form of
CO2 for your 30g.
I'm currently running 2.6
WPG and all my various swords are thriving with the exception of the micro sword. I think this is due to not enough light, due to the micro being so much shorter and a forground plant. The micro is slowly growing under my 2.6
WPG, it's simply not thriving like the rest of my tank.
As for my amazons, melons, marble queens, red somethings (can't recall the name at the moment
), they are all thriving under my 2.6WPG. In fact, this evening I plan on cutting babies from a couple of amazons and planting them.
Swords in general like 2.5-3.5
WPG and root tab ferts. The shorter carpet swords lean towards the higher light, which makes since. The light looses intesity the deeper it has to travel to the bottum of the tank.
Also, don't overdose on root tab ferts, or your tank will have a terrible Phos spike that leads to a nasty cause of BGA, thats a major pain to get rid of. Trust me on this one