Chalices and Favia placement

[Robin316us]

Hi all where do you place the chalices and favias? Just noticed that 2 of the chalices started showing bit of skeleton. I've T5(4 Blue plus) and 3 Hydra 26. I placed them at the bottom of the tank. I run T5 around 4 hours during midafternoon. I got the chalices and the T5 around 3 weeks.

 

[Mastiffsrule]

Good evening

sorry for the delay.

there could be a few things affecting the coral along with lighting. Could we get more info.

tank size, age, parameters, and flow will help. What is you settings for the AI colors and power. Are there any other coral in the tank having problems with the new T5 along with the AI. Did you quarantine or dip the corals?

see if we can narrow down the possible causes