I never thought I would see them too... There are some on the cauliflower, around 5-6...
But the rocks will be very ugly as it is dead rock and cement, will need to wait for it to cure and grow coraline...
I know of this method... But this colony is huge... LOL... Need to find a container that will fit this in... I am directing more flow to it so that the food will get to them more easier to entice them to open up..