Question: Depth of the tank
 

I am looking for a 3 feet tank, I already purchased a used 4x39w T5. I am wondering what would be the best depth so i can growth SPS and LPS? I am thinking of 18'' but not sure if it is too much light for lps if they sitting at the bottom

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a lot will depend on which fixture you bought. You can always raise the light if it's too strong.
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i bought this one Current USA Sundial 36" T5 High Output 4x39w 10K/460

my 2 brains are doing fine with an 18"dp tank. I have a Aquatic life 4 bulb T5 on it..

with a sundial at 18" deep, i wouldn't expect to much at the sand. mid tank to the top you should have sucess with certain acro's, monti's and stylo's (more of the lower light sps)

Thanks. ok I change my plan so now i have 15 feet deep cube with a 250W sunpod. Can i have some clam?

Thanks

Typo I think. 15 FEET deep???!!!!

uh.. you definitely can not have clams with a 250w at 15 feet depth.. but man, call me over when you get that cube set up!!! :lol:

If you mean 15" then a 250 watt is going to blast the holy heck out of your tank floor with light. You can grow SPS and clams on your sandbed, no need to raise anything off of the sand bed, LOL.

I think the key is (as mentioned above), if you're finding you have too much light, raise your light fixture, not enough, lower it. From 15" to 18" either light fixture should work once you find the sweet spot for where to hang the light.

Sorry it is 15 inch :-) Thanks for advice. Weeee shopping time