I need some pond lighting for my patio ponds.
That was great advice. I need both.Then scratch my comment. I don't think there are any underwater lights that contribute to plant growth.
I really don't know of any solutions that would work on a tub. I'd just grow plants that are happy with the amount of natural light you have.
My old pond growing up was under a 100-plus year old oak. It gets all shade all the time. There is an Iris growing in it that's bigger than I am. Parrot's Feather, elodea, acorus, and Hogwart have all grown in it.That was great advice. I need both.
So far I've only found water lettuce that should make it.
https://www.google.com/search?q=purple+taro+plant&oq=purple+taro&aqs=chrome.3.69i57j0l5.6277j0j7&sourceid=chrome&ie=UTF-8I was looking for purple taro ave a veggie came up.