Thanks! Had missed the post!
I'd advise against more than one plant in the bucket, unless you have to due to space restrictions. Especially in a bucket that big, they may turn really huge and start competing for space and light.
My largest buckets are like 17 gal, and only used for photos. If you do two plants, place them on opposite sides by the edges of the longest side of the tank, rather than close to each other in the center. Make sure both are autos.
I'd run them each in a bucket of 10 gal for autos and 17 to 20 gal for photos.

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