first of all, the plant at center is not an aquatic plant.
Answering your question
1) Different plants species grow differently, some plant does not even have a roots.
2) Cycle mean to let the tank and filter run without fauna for couple a weeks. The purpose is for Beneficial bacteria (BB) build up in the filter media. The BB will confert toxic waste into less toxic nitrate.
3) To be safe normally wait for 4 weeks
4) Shrimps are scavenger, it will eat what ever left over.
5) Depend on you light. More light mean faster photosynthesis mean need more CO2
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