Hi, have you posted this to the Aquatic plants forum here? Even bog plants might not love sitting in water all the time, though it's hard to know from here exactly how much (inches?) there is.

I havent tried the aquatic plants section yet, but I will do! I may try some traditionally aquatic plants, grown in an emersed state. will see what ideas i get from here first. :)

The attached link shows a pic of the troughs. as said they are 4x4' in cross section. water enters on the right, near the top. This end has water at about 3' depth.

As the water travels through the media, it decreases in depth down to about 1/2' on the left.

Here is a link that might be useful:

I have grown Pothos in nothing but water for years at a time, Im sure it will do great in your set up, unless your looking for something a little more exotic/tropical, Ive friends who have grown spider plants in the same manner with very good results, but agian, dont know if you might want a more exotic/tropical plant. All you really have to do is go to your local "plant lady" (theres one in every community) shes either your, or someone elses granny, Im sure she will show you a managery of plants growing in water filled jars on her window sill! Theres also at least one in just about every office building =) Good luck.

Water mint (Mentha aquatica) or other spreading plants might look nice as a green carpet to cover the troughs. Plants like aquatic arums or arrowheads would look great if you want a little bit of height as well. You could use a spreading plant to cover the media along with some taller more sculptural species for added interest and variation of foliage types.

hello
I'm working on a similar setup though my bog area is 8x72 located behind a 150 gallon tank. I'm using this as an area to collect water from the waterfall and channel it back into the tank. Haven't decided the media for this section though i think I'll use crushed black lava rock and maybe some shagnum.
Almost any type of aquarium plant will grow in this situation.Crypts and swords love it.Most of the creeping types and even the stem plants. Pond marginals as well as the Alocasias,Colocasias,Philos ,Nephritis ,Acorus and on and on. For trees there are Mangrove,Cypress,some types of palms.,Ficus,,Hibiscus and on and on. lol.
Since you have such good light you should be able to grow most anything except maybe temperates.lol
if you're keeping discus you must be maintaining warm temps so would stick with lowland tropicals.
Sounds like a fantastic setup!!
gary