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?

[Casey]

Deresa would be fine other two I would prefer 250s Mh .MO

[hummusx]

Originally Posted by Casey

Deresa would be fine other two I would prefer 250s Mh .MO

You're saying that there is no depth at which they'd thrive under 175s?

[Casey]

No im saying in your tank at your 20 in depth I use 250sIn a shallower tank 175s are fine.If you try them put them way up high in the rocks as close to the light as you can get them.The par on 175s is not great.