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Dwarf sag will grow nicely for you as a foreground plant.

At 2wpg you can grow many plants, infact if I were considering an upgrade, I would probably add a CO2 tank, that would probably give you better results than the lights alone. If you were to upgrade your lights, you should also get a CO2 tank.

Here's what I'm growing in a 90 gallon with just over 1wpg, heavy fish load and no additional CO2:

Limnophila aromatica
Frog bit
Java Fern
Cryptocoryne
Aponogeton
Ozelot Sword
Various Anubias
Java Moss
Limnophila Aquatica (Ambulia)
Ludwigia mullertii
Ludwigia repens
Nymphaea Lotus zenkeri (Red Tiger Lotus)
Hygrophila siamensis (Giant Hygro)
Hygrophila difformis (Wisteria)
Hygrophila polysperma (Sunset Hygro)
Lobelia cardinalis "small form"
Ceratopteris thalictroides (Watersprite)
Nymphoides aquatica (Banana Plant)
Ceratophyllum demersum (Hornwart)
Lemna minor (Duck Weed)
Sagittaria subulata (Dwarf Sag)

Hope that helps
Giancarlo Podio
 

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There is no set rule unfortunately. If you consider we are using watts, which is the amount of energy consumed rather than light output, this alone tells you that it's a flimsy rule. For example 2wpg of CF is more than 2wpg of NO. Then we use volume of our tanks which doesn't really correlate with the surface area the lights need to cover, and also doesn't take into consideration the depth of a tank. I'm sure finding a more accurate measurement is easy enough, lumens per square inch of surface might be more accurate, but it becomes something you need to calculate each time and WPG is just too easy to calculate off the top of your head.

Now about this "rule of thumb 2+wpg". That's just untrue, there is no rule of thumb because it all depends on what you want to grow. 1WPG in a large tank for example will grow many plants. 2WPG in a large tank with CO2 will grow just about anything. Smaller tanks need more light to compare evenly, a ten gallon for example would probably require 3wpg to be similar to a larger tank with 2wpg. With medium to large tanks, going over 2WPG usually requires the addition of CO2, this is perhaps the rule of thumb you are referring to. It is also commonly said that over 2WPG is considered moderate to high light and below is considered low light, but both will grow plants, just different ones.

Hope that helps
Giancarlo Podio
 

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Like I said, there is no good or bad unless you don't have enough light to keep an anubias alive or have so much light that the fish are wearing sun glasses. 2WPG in a 30 gallon tank is not bad at all, using 3 tubes also provides far better spread than using a single CF. It's probably not something you want to grow glosso or eausteralis stellata in, but give it the right conditions and it will grow many plants. Give it additional CO2 and you'll be able to grow most plants with the exception of the ones that require very intensive lighting.

What do you want to grow??? What kind of tank are you looking to manage, a race horse that needs weekly service and bi-weekly prunings or a tank that needs bi-weekly service and monthly prunings???

It all depends on what you want to have. I for one have only time for one high light tank, my others are all low to very low light tanks. I've kept low light planted tanks for around 15 years and high light tanks only the last 2-3 years.

Here's some photos of my 90 gallon with 1WPG:





And the 55 gallon with 4WPG:



As you can see, they are just different, not good or bad. Success can be acchieved with both, low-moderate light is more forgiving however.

Hope that helps
Giancarlo Podio
 

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The 90 gallon uses the All-Glass tripple T8 fixture (3x32W) and the 55 gallon at the time of the photo was actually running 4WPG on the left side and 2WPG on the right (2x55W CF on left half and 1x55W CF on right). Since then I upgraded it to 2x40W x2ODNO plus a single 55W over the left half.

I don't think they make 40W CFs, probably just a typo.

Giancarlo Podio
 
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