I was having problems with my light (ballast and bulbs) and found it wasn't intense enough for the clams so I upgraded the light over my shallow tank from the Viper 70 to a 250 watt metal halide. The light is too intense for the zoas and mushrooms I had in there so I did some major rearranging. Here's what the three tanks look like now.
http://i274.photobucket.com/albums/j...rent_F/rsq.jpg
http://i274.photobucket.com/albums/j...rent_F/tpd.jpg
http://i274.photobucket.com/albums/j...rent_F/ncs.jpg

some closeups
http://i274.photobucket.com/albums/j..._F/clam015.jpghttp://i274.photobucket.com/albums/j..._F/clam019.jpg
http://i274.photobucket.com/albums/j..._F/clam037.jpghttp://i274.photobucket.com/albums/j..._F/clam039.jpg
http://i274.photobucket.com/albums/j...rent_F/rsw.jpg
http://i274.photobucket.com/albums/j...ent_F/tpoh.jpg

My snails always get above the water line. all types margs and turbos. the new set looks great. quite the sand bed in the one tank.

your last post i believe is of the max and it looks like you have gotten rid of one of the original PH's and added a koralia in its place is this the case?

No, it is a "Hydor FLO" attached to the stock Red Sea powerhead nozzle

The deep sandbed in the Nanocube 6 is for a jawfish

Here's my latest addition hiding under a clam. It's a Frogfish. The Pajama Cardinal had to be moved to another tank to make room for this guy. They can swallow fish close to their own size so aren't compatible with much else. Great fish for a clam and urchin only tank.
http://i274.photobucket.com/albums/j...ent_F/frog.jpg

Here's a picture showing the diffence in light between the Red Sea Max and the 250W metal halide over the open tank
http://i274.photobucket.com/albums/j..._F/clam003.jpg

I'm tired of my urchins tearing up my SPS so decided to setup another tank to move the urchins to. I picked up a 90 gal, a 67 gal and ASM G1-X skimmer used for a third the cost of my RSM. This will be setup as a FOWLR tank with a refugium in the sump setup as a second display.
http://i274.photobucket.com/albums/j...F/IMG_1184.jpg

So this is tank #4? Sweet! I'm planning tank #2, and am out of room already.

Finally got a jawfish for the deep sand bed in my nanocube 6
http://i274.photobucket.com/albums/j...ofIMG_1214.jpg
Frog fish day 1 and 10 days later. It is closer to the rock colour now
http://i274.photobucket.com/albums/j...Copyoffrog.jpg
)http://i274.photobucket.com/albums/j...ofIMG_1236.jpg

Nice jawfish i have a pearly in my RSM. he is awsome lots of personality. give him at least a week befor he starts to dig........ i hope you have a good rock base.

Near the top of page 7 there's a picture of the sand base. It's a mix of sand, live rock rubble and crushed shells