I have a 40g breeder with 1 hydra 26 (I'm going to add a 2nd soon). I added a ricordea and acropora frag to the tank. The ricordea is doing great but the acropora bleached within 48 hours. I am running my lights at 25% right now. Is it possible my lights bleached it or is there more likely a different cause. The acropora was on a rock in the very middle of the tank. The lights are about 8 inches off the water.