Who Gives A Fish Forums

I've got two types of frogspawn coral going on - one's purple, the other's green-tipped. Every day around 8 pm, the purple one shrinks up and the green one pretty much disappears into its skeleton. They're out for an hour, then they're back to normal. Lights are still on, no changes there - 11 hours ...

Mine did the same thing, around 7-8pm for a bit, now it's happy and stays open till the lights dim.