Uh-Oh!

Having some fast growing stems would help avoid algae while the plants are becoming established. I don't use stems other than in veggie filters routinely myself, but I do commonly have some in new setups.

I also wonder where the worms/planaria whatever came from. If you got a lot of java moss from an old tank, that could be it - it is refuge for all sorts of inverts.

The fungus/mold is self-limiting, not an issue unless you see it routinely. Then it means uneaten food.
 
Thanks for the clarification, RTR, your expertise is appreciated.
 
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