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With 260 watts on a 90 gal, you can grow pretty much what you want (except the light will be weaker by the time it hits the substrate due to the height of a 90 gal) .

If you still want low-light, only use two bulbs (130 watts) and you'll be right on target for swords, anubias, crytocorynes, java fern, mosses, and even some marsilea (for groundcover).

I wouldn't use the actinics because, although the plants may not use that light, it will still add some amount of brightness, in combination with the other bulbs, and your fish may still be reluctant to come out in the day.

-Dave
 

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Plan on putting the lights on timers during the day and using the lunar lights more at night to entice the plecos to become more active. Is 10 hours of light per day the norm for Swords, Crypts, Vallisneria and Anubias Nana. Would something like Excel work instead of a CO2 setup.
10 hrs is fine. If you are starting off with 260 watts, it would be better to start with a shorter photoperiod (6-7 hrs) and work your way up from there.

I would not rely on Excel only as a carbon source with higher light. DIY CO2 + Excel, or pressurized. If you go with only half the bulbs, maybe you could get by with just the excel. Have you thought about fertilizers (liquid vs. dry) ?

-Dave
 

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Don't use fertilizer sticks. Check out this extremely helpful article that Niko posted up awhile back (you can find it in the sticky "The Basics" in the New to Planted Tanks area):

http://www.aquatic-plants.org/articles/basics/pages/index.html

Also, read through the stickies in the "Fertilizing" forum. Your plants will need Nitrogen, Phosphorus, Potassium (macro-nutreints) and micro-nutrients (iron, magnesium, boron, etc... ) .

There are a few companies that make liquid ferts (Seachem/Flourish, Pfertz, Do!Aqua... ) and you can get dry ferts from many places (like greenleafaquariums.com) . I'm partial to dry ferts using the Estimative Index method, but PPS-pro has worked better for some people and Seachem has a dosing guide/schedule for their Flourish line.

How much fertilizer your plants need will depend on your lighting and your plant density. Figuring out fertilization is where ALOT of us have hit walls, grown algae farms, and read articles/asked question until our brains hurt. Spend some quality time researching this topic before you get going on it. It can save you alot of greif down the road. ;)

-Dave
 
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