hi there
i love your post!
My friend why to discover new ways when you can walk the good ones?
google for Imke's shrimp food and you will find good receipts all of them the best IMO
for dryed banana leaves ( you can use stinging nettle instead, walnut leaves are avaiable in your region also, mulberry leaves, cherry leaves, apple tree and such.... ) put some spirulina also ...
but you can find a ornamental banana tree i think and get a bity of that too LOL!
good luck!
my last batch of DIY food turned from bright green to black but they love it!