Not enough light/ food most likely light. Does it still have bubbles?
If you want it to split, get some expensive acro frags and glue them down around the tank. He will immediately split into three and wander around the tank finding spots right next to your most expensive and prized acros. At least, that’s what mine did...lol.
. Stick with it, it’s great when everything finally comes together and you can watch your reef grow. You’re going to get things wrong. And get things right. Some things will die on you (ask me about my velvet outbreak sometime, still makes me sad). But it’s so great when something you love grows and thrives. Keep asking questions, lots of really smart people here 
need to feed bigger food ive had my clowns grab a big piece of LRS food and feed it to my nem it split the next day
Can you change the led to blue setting? The anemone will most likely show more color under the blues. They don't look the same under white. Blues bring out the florescence in the anemone
I feed mine a slice of raw shrimp (kind you buy at the grocery store). I don't have clown fish trying to get the food, but the cleaner shrimp are ravenous. I shoo them away with a stick until the nem has taken the food. Mysis shrimp are very small and probably easier for the clowns to grab.
