I would harvest it to maintain my phosphate. If you let it go wild it will exponentially consume it until is bottoms out. This happened to me in the past and the coral didn’t last, and neither did the cheato. I recommend about a small orange size for every 20 or so gallons and once it doubles, harvest and give it away or toss. If your phos is coming up, keep it a bit bigger at harvest, and if phos is dropping fast, cut it in half.