the hc cuba wont grow with that light, you will need another 11w for it to do well.
theres 2 ways you can go:
low maintinance:
lower light-11watts
less easycarbo-about 1ml a day
less tpn+-about 1.5ml a day
low light plants, vailis, cambomba, crypts, ferns, mosses, anubias
less cutting needed becuase the plants grow slower
higher maintancance:
higher light-22watts
easycarbo @ 1.5ml a day
tpn+ @ 2-2.5ml a day
nicer plants, such as hc cuba, p.helferi, blyxa, rotala.
more growth due to higher light, fert dosing and co2 = more cutting
plus both of that list would need some type of nutritious substrate, like tropica plant substrate, and then wack some sand or fine gravel on top
good luck
Or...
11 watt, even less maintenance in the long run...
-No CO2
-No ferts
-crypts, anubias, java fern, java moss, marsilea hirsuta, Egeria najas (great plant), vallis nana (another awesome plant), E. tennelus, I can go on, but you get the idea
-keep the substrate you've got, unless it's really obnoxious, the nutricious substrate is an easy plus, but not absolutely necessary
-add some root tabs once every 3 months or when you remember, or dose like AdAndrews said
-put wood and rocks in your hardscape (they leech important trace elements)
-keep your water very clean
-over filter and make sure you have good water circulation
-slightly over stock with smaller fish (this is really the fun part!)
-be a little agressive with water changes while the tank is young, 3-6 months, then you can ease off.
-densly plant with mostly stemplants initially, covering like 75% of the substrate. Or if you don't like this, I find that placing Pothos sprigs in the water helps too.
Not saying that the above two are bad, they're great, and work very well. I just personally find them a bit heavy on the gadgetry and maintenance, and it saves you some money that you can use for plants, fish, and hardscape, which is what I prefer buying. The above is what I typically do, and algae only appears when I'm lazy and
don't do water changes like I'm supposed to (like last semester!), or when I'm rescaping (which I sometimes do) and I get an ammonia spike, otherwise I don't have many problems. Now, this could be due to my water composition, but it may be something to try. You do have to put up with a jungle for a while and probably tannic water, but I kind of like the look. I used to use CO2 quite a bit but I find it isn't absolutely necessary where I currently live, unless I really want to go high-light,which then opens up the whole "maintenance" thing, which I can't stand doing anyway.
It is up to you, really.