175w halides enough?

I have a 75 gal tank with 2 175MH with 440 of atinics. I have kept two maximas for about a year now. Both clams sit on the bottom. I also feed pyhto
 
I also run Duel 175watt Ushio 10K MH's and duel 110 watt VHO actinics on my 90gal. and I keep SPS and LPS with some softies along with my 4 inch Blue Maxima Clam that is very healthy and colorful. He is about 15 inches from my light. Some people will tell you that 250-400 watt MH's are the only way to go but thats there opinion. Listen to the people that have the same lighting as you and are keeping them successfully:) Or contact Barry from clams direct he will tell you;) Check out my clam in my gallary:cool:
 
I have 2 x 175 MH and 2 x 110 VHO actinic on a 120 which is 3" higher than your tank.

I have a deresa and a crocea on the sand. You can see a pic on my website.
 
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