@Wookii was kind enough to send me some frogbit and red root floaters. Those came on Thursday, and a majority of them were a vivid green.
Since putting them in my tank, some of the frogbit has yellowed, the majority has stayed qreen but a lot of the red root floaters have just parted ways with their roots. The roots have gotten pretty long on some of the frogbit (+3 inches) and I can see some baby plants coming through from a couple.
I trimmed the roots on the Frogbit for easier shipping, but they always grow back, and can end up very long.
The were out of my high tech tank, so may need to do some transitioning to your water parameters - but they are all pretty resilient plants and providing you dose a decent amount of ferts (and get rid of that ammonia 😉), they should reward you with quite considerable growth due to their easy access to unlimited CO2.
Just pinch off any damaged or yellowing leaves and it will encourage the plants to put out new growth.
Incidentally I’ve never managed to get the red root floaters to actually go red, beyond a gentle reddening of the roots, and some red to the edges of the leaves - but nothing like the solid red leaves you see in images on the net. I’ve read that the darker colouration occurs under strong light, But despite mine being directly under quite considerable light, they still haven’t ‘turned’.