Just an update on the hex: after being set up for a couple weeks the lovely brown algae is all over the place. I put some ramshorn snails in and they are making quite a feast of it. Good snails.
Hi Jane, it is a black clamp lamp with white on the inside. Rated for up to 250 watts (reptile bulbs and such). The bulb is a 12 watt spiral fluorescent. It's hanging about 2 or 3 inches above the top of the tank. I actually thought the bowl was getting too much light, and that's why the hygro didn't want to grow and the floating plants were getting toasted. There is definitely a lot of light reflecting off the hex walls, it makes it very difficult to photograph!

How will I know if the plants are getting enough light?
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PS - I was perplexed with your 1 gallon bowl why the shrimp would be OK but the ramshorns dying. Unless they were worried to death by Twizzler's constant attentions?
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I find this perplexing too.

My best guess is that when the algae ran out, the snails didn't have anything to eat, whereas the shrimp happily dined on dying leaves. Or perhaps the shrimp out-competed the snails for food. I have a 10 gallon with just shrimp and ramshorns, and I've noticed the ramshorns aren't breeding like they did before the shrimp moved in.