i just got 2 ricordeas and was wondering where in the tank i should place them. i currently have them in the sand and the green one is doing great but the orange has turned tan in color and is starting to close up. i also have a frogspawn that i have placed about 8" from the top of the tank and it was doing good but now it wont open up as much as it used to. any ideas on a better place to put these corals?