New tank setup, 50/50 Marco & KPS aquatics rock. Only been up for about 3 weeks now with fish only. I have yet to add any corals or clean up crew. This guy stays 100% retracted during the day when the lights are on but only extends at night. What could he be? I only have this one at this time. If I need to get better photos let me know and I can retry. thanks in advance!