Clam Lighting

[hummusx]

My tank is 22" deep and I have about 2" of substrate. The lights are positioned about 6" above the water. I'm wondering how these would do directly underneath a 175w 10k MH lamp:

Deresa
Crocea
Maxima

Would they be ok at the bottom of the tank, or will the M and C need to be closer to the light? Can the Deresa receive too much light, does it need to be near the bottom?

 

[mbbuna]

Derasa's are sand dwelling clams so it will be fine down there.
the Crocea and Maxima live up in the reef on the rock's and they should be fine 1/2 to 2/3 u in the rocks. i would start them on the sand first,by putting a small ruck under them and when they grab the rock u can move them up where u like.