As ye were discussing, I wouldn't try go full Bioactive in the tub. 6-8 weeks before you are upgrading the snake into the bioactive enclosure you can start setting it up with plants and critters to allow them to get established. You mentioned you have them in a sunroom so I'm assuming you wont need to experiment with UVB lighting for the plants which will make things easier (...assuming as I know nothing about sunrooms).
If you want to add the plants to the tub there is no issues there as you mentioned you have them rinsed and stuff. Just keep in mind that you will likely be starting again because the plant might not survive being in there with he snake depending on how sturdy it is and how much light is getting in.
If you aren't planning on putting the snake into the bioactive enclosure any time soon I'd say its worth doing though as you can see what works and what doesn't. You can always get more plants when the time comes.
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