When can you release newborn platies with the adult fish in main tank?

It's generally recommended to wait until your newborn platies are at least 3 weeks old before introducing them to the main tank with the adult fish.

Here's why:

* Size: Newborn platies are very small and vulnerable. Adult platies, especially males, may see them as food and attempt to eat them.

* Development: Young platies need time to grow and develop their swimming skills before they can compete with the adults for food and space.

* Stress: Introducing young fish into a new environment with larger, more dominant fish can be stressful, which can hinder their growth and development.

Here are some tips for introducing young platies to the main tank:

* Observe: Make sure your adult fish are calm and not overly aggressive before introducing the young ones.

* Gradually: Introduce the young platies to the main tank gradually by placing them in a breeding box or a smaller tank within the main tank for a few days before releasing them.

* Plenty of hiding spots: Provide plenty of plants and rocks in the main tank so the young platies have places to hide from the adults.

* Plenty of food: Ensure there is plenty of food available for the young platies to compete for, to minimize the risk of aggression.

Remember, every tank and every fish is different. Monitor the interactions closely and be prepared to separate the young platies again if needed.