How to increase biofilm?

I believe moss is enough to grow biofilm, but you might want to add some leaves, they're great for growing some biofilm. Actually any clean leaves will do.

Do you mean Indian Almond Leaf? I have some. I used to put a piece into the shrimp tank, but my shrimps were not interested to it at all even it was in the tank for 4-5 weeks. Then I remove the leaf.

Yes, Indian Almond leaf will work.

Oak leaves are free and work also.

Keep in mind that algae and biofilm are different. Even if your glass looks clean, you most likely have plenty of biofilm unless you are just constantly razor blading all your glass, lol.

For leaves, they will go to town on them once they break down enough. I often have Indian Almond Leaves that take three to four weeks to break down enough. There are other benefits to the leaves as well, so I'd recommend leaving them in there

Other than that, something like Bacter AE will do well, but it's way too expensive for me to justify. Maybe a breeder who absolutely needs higher success rates, but I almost can't sell them fast enough to keep up already...

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For me biofilm occurs when I don't have much surface agitation.

You need to leave the almond leaf in the tank, the bio-film on it's surface isn't always visible. If you have access to Alder leaves they're both good for tannins and bio-film.

Do you have another tank that grows film algae on it's glass? You can always use an old credit card to scrape off some sheets to feed both the adults and babies.

I have another 5G tank (same size) next to it with about 80-100 PFR shrimps. In that tank, there are lot of shrimp poop. Bio load is high. A lot of algae too. There is always a thin layer or surface screen in the tank. It breaks to small pieces if I pop it with my finger. I screen it out, and it forms again next day. Shrimps like to hang on the floating plant to eat the surface screen. Is the surface screen consider biofilm?