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Let’s start from the top...Were the floating parts still rooted in the subtrate? I uprooted some of mine to have it as some floating foliage but I can't say that it's been a success.
This is usually because the sellers raise the plants in very cold water. When it is presented with heat, it will melt. I accidently did this to one batch of anacharis in my new 20g long. It looked melted for about a week. It is just now starting to grow new shoots.Put it in a tropical tank and it is likely to melt beyond recovery.
Looks great. TBH none of those plants are particularly demanding and there should be no need for CO2. That is used for plants that require intense lighting, and needs intense light to balance it.
Java fern and anubias don't need much light and don't appreciate it. Vals and elodea will grow in most conditions. There is a danger that in time your anubias and java fern will go brown and become a home for algae, particularly hair algae.
Anacharis will melt us you use Seachem Flourish.It is very fast growing and really does a great job at absorbing ammonia so depending on how much you have yes it may be possible. The floating plant in my 55 gallon tank is anacharis and I had a lot of it when this picture was taken, my ferns seem to do well and my swords had root tabs.